--- a/b2g/config/aries/sources.xml
+++ b/b2g/config/aries/sources.xml
@@ -10,17 +10,17 @@
   <!--original fetch url was git://codeaurora.org/-->
   <remote fetch="https://git.mozilla.org/external/caf" name="caf"/>
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
   <project name="platform_build" path="build" remote="b2g" revision="e862ab9177af664f00b4522e2350f4cb13866d73">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
-  <project name="gaia" path="gaia" remote="mozillaorg" revision="862f0895f3f5a97200601542d99a152a46385a0b"/>
+  <project name="gaia" path="gaia" remote="mozillaorg" revision="21256d7665f972255d198f8af81a8df4bd0e0fc4"/>
   <project name="fake-libdvm" path="dalvik" remote="b2g" revision="d50ae982b19f42f0b66d08b9eb306be81687869f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="9f45c1988fe72749f0659409e6e3320fabf7b79a"/>
   <project name="librecovery" path="librecovery" remote="b2g" revision="1b3591a50ed352fc6ddb77462b7b35d0bfa555a3"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="657894b4a1dc0a926117f4812e0940229f9f676f"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="5ef30994f4778b4052e58a4383dbe7890048c87e"/>
   <project name="valgrind" path="external/valgrind" remote="b2g" revision="daa61633c32b9606f58799a3186395fd2bbb8d8c"/>
   <project name="vex" path="external/VEX" remote="b2g" revision="47f031c320888fe9f3e656602588565b52d43010"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="5bb657ada461be666c35f419dbe072ed2ce632fc"/>

--- a/b2g/config/dolphin/sources.xml
+++ b/b2g/config/dolphin/sources.xml
@@ -10,17 +10,17 @@
   <!--original fetch url was git://codeaurora.org/-->
   <remote fetch="https://git.mozilla.org/external/caf" name="caf"/>
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
   <project name="platform_build" path="build" remote="b2g" revision="e862ab9177af664f00b4522e2350f4cb13866d73">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
-  <project name="gaia" path="gaia" remote="mozillaorg" revision="862f0895f3f5a97200601542d99a152a46385a0b"/>
+  <project name="gaia" path="gaia" remote="mozillaorg" revision="21256d7665f972255d198f8af81a8df4bd0e0fc4"/>
   <project name="fake-libdvm" path="dalvik" remote="b2g" revision="d50ae982b19f42f0b66d08b9eb306be81687869f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="9f45c1988fe72749f0659409e6e3320fabf7b79a"/>
   <project name="librecovery" path="librecovery" remote="b2g" revision="1b3591a50ed352fc6ddb77462b7b35d0bfa555a3"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="657894b4a1dc0a926117f4812e0940229f9f676f"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="5ef30994f4778b4052e58a4383dbe7890048c87e"/>
   <project name="valgrind" path="external/valgrind" remote="b2g" revision="daa61633c32b9606f58799a3186395fd2bbb8d8c"/>
   <project name="vex" path="external/VEX" remote="b2g" revision="47f031c320888fe9f3e656602588565b52d43010"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="5bb657ada461be666c35f419dbe072ed2ce632fc"/>

--- a/b2g/config/emulator-ics/sources.xml
+++ b/b2g/config/emulator-ics/sources.xml
@@ -14,17 +14,17 @@
   <!--original fetch url was git://github.com/apitrace/-->
   <remote fetch="https://git.mozilla.org/external/apitrace" name="apitrace"/>
   <default remote="caf" revision="refs/tags/android-4.0.4_r2.1" sync-j="4"/>
   <!-- Gonk specific things and forks -->
   <project name="platform_build" path="build" remote="b2g" revision="1b0db93fb6b870b03467aff50d6419771ba0d88c">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="fake-dalvik" path="dalvik" remote="b2g" revision="ca1f327d5acc198bb4be62fa51db2c039032c9ce"/>
-  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="862f0895f3f5a97200601542d99a152a46385a0b"/>
+  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="21256d7665f972255d198f8af81a8df4bd0e0fc4"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="9f45c1988fe72749f0659409e6e3320fabf7b79a"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="5ef30994f4778b4052e58a4383dbe7890048c87e"/>
   <project name="platform_hardware_ril" path="hardware/ril" remote="b2g" revision="8bc59310552179f9a8bc6cdd0188e2475df52fb7"/>
   <project name="platform_external_qemu" path="external/qemu" remote="b2g" revision="9d0e5057ee5404a31ec1bf76131cb11336a7c3b6"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="657894b4a1dc0a926117f4812e0940229f9f676f"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="34ea6163f9f0e0122fb0bb03607eccdca31ced7a"/>
   <!-- Stock Android things -->
   <project name="platform/abi/cpp" path="abi/cpp" revision="dd924f92906085b831bf1cbbc7484d3c043d613c"/>

--- a/b2g/config/emulator-jb/sources.xml
+++ b/b2g/config/emulator-jb/sources.xml
@@ -12,17 +12,17 @@
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
   <project name="platform_build" path="build" remote="b2g" revision="660169a3d7e034a892359e39135e8c2785a6ad6f">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="5ef30994f4778b4052e58a4383dbe7890048c87e"/>
   <project name="fake-libdvm" path="dalvik" remote="b2g" revision="d50ae982b19f42f0b66d08b9eb306be81687869f"/>
-  <project name="gaia" path="gaia" remote="mozillaorg" revision="862f0895f3f5a97200601542d99a152a46385a0b"/>
+  <project name="gaia" path="gaia" remote="mozillaorg" revision="21256d7665f972255d198f8af81a8df4bd0e0fc4"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="9f45c1988fe72749f0659409e6e3320fabf7b79a"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="657894b4a1dc0a926117f4812e0940229f9f676f"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="5bb657ada461be666c35f419dbe072ed2ce632fc"/>
   <project name="valgrind" path="external/valgrind" remote="b2g" revision="daa61633c32b9606f58799a3186395fd2bbb8d8c"/>
   <project name="vex" path="external/VEX" remote="b2g" revision="47f031c320888fe9f3e656602588565b52d43010"/>
   <!-- Stock Android things -->
   <project groups="linux" name="platform/prebuilts/clang/linux-x86/3.1" path="prebuilts/clang/linux-x86/3.1" revision="5c45f43419d5582949284eee9cef0c43d866e03b"/>
   <project groups="linux" name="platform/prebuilts/clang/linux-x86/3.2" path="prebuilts/clang/linux-x86/3.2" revision="3748b4168e7bd8d46457d4b6786003bc6a5223ce"/>

--- a/b2g/config/emulator-kk/sources.xml
+++ b/b2g/config/emulator-kk/sources.xml
@@ -10,17 +10,17 @@
   <!--original fetch url was git://codeaurora.org/-->
   <remote fetch="https://git.mozilla.org/external/caf" name="caf"/>
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
   <project name="platform_build" path="build" remote="b2g" revision="e862ab9177af664f00b4522e2350f4cb13866d73">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
-  <project name="gaia" path="gaia" remote="mozillaorg" revision="862f0895f3f5a97200601542d99a152a46385a0b"/>
+  <project name="gaia" path="gaia" remote="mozillaorg" revision="21256d7665f972255d198f8af81a8df4bd0e0fc4"/>
   <project name="fake-libdvm" path="dalvik" remote="b2g" revision="d50ae982b19f42f0b66d08b9eb306be81687869f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="9f45c1988fe72749f0659409e6e3320fabf7b79a"/>
   <project name="librecovery" path="librecovery" remote="b2g" revision="1b3591a50ed352fc6ddb77462b7b35d0bfa555a3"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="657894b4a1dc0a926117f4812e0940229f9f676f"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="5ef30994f4778b4052e58a4383dbe7890048c87e"/>
   <project name="valgrind" path="external/valgrind" remote="b2g" revision="daa61633c32b9606f58799a3186395fd2bbb8d8c"/>
   <project name="vex" path="external/VEX" remote="b2g" revision="47f031c320888fe9f3e656602588565b52d43010"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="5bb657ada461be666c35f419dbe072ed2ce632fc"/>

--- a/b2g/config/emulator-l/sources.xml
+++ b/b2g/config/emulator-l/sources.xml
@@ -10,17 +10,17 @@
   <!--original fetch url was git://codeaurora.org/-->
   <remote fetch="https://git.mozilla.org/external/caf" name="caf"/>
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
   <project name="platform_build" path="build" remote="b2g" revision="07c383a786f188904311a37f6062c2cb84c9b61d">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
-  <project name="gaia" path="gaia" remote="mozillaorg" revision="862f0895f3f5a97200601542d99a152a46385a0b"/>
+  <project name="gaia" path="gaia" remote="mozillaorg" revision="21256d7665f972255d198f8af81a8df4bd0e0fc4"/>
   <project name="fake-libdvm" path="dalvik" remote="b2g" revision="d50ae982b19f42f0b66d08b9eb306be81687869f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="9f45c1988fe72749f0659409e6e3320fabf7b79a"/>
   <project name="librecovery" path="librecovery" remote="b2g" revision="1b3591a50ed352fc6ddb77462b7b35d0bfa555a3"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="657894b4a1dc0a926117f4812e0940229f9f676f"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="5ef30994f4778b4052e58a4383dbe7890048c87e"/>
   <project name="valgrind" path="external/valgrind" remote="b2g" revision="daa61633c32b9606f58799a3186395fd2bbb8d8c"/>
   <project name="vex" path="external/VEX" remote="b2g" revision="47f031c320888fe9f3e656602588565b52d43010"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="5bb657ada461be666c35f419dbe072ed2ce632fc"/>

--- a/b2g/config/emulator/sources.xml
+++ b/b2g/config/emulator/sources.xml
@@ -14,17 +14,17 @@
   <!--original fetch url was git://github.com/apitrace/-->
   <remote fetch="https://git.mozilla.org/external/apitrace" name="apitrace"/>
   <default remote="caf" revision="refs/tags/android-4.0.4_r2.1" sync-j="4"/>
   <!-- Gonk specific things and forks -->
   <project name="platform_build" path="build" remote="b2g" revision="1b0db93fb6b870b03467aff50d6419771ba0d88c">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="fake-dalvik" path="dalvik" remote="b2g" revision="ca1f327d5acc198bb4be62fa51db2c039032c9ce"/>
-  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="862f0895f3f5a97200601542d99a152a46385a0b"/>
+  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="21256d7665f972255d198f8af81a8df4bd0e0fc4"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="9f45c1988fe72749f0659409e6e3320fabf7b79a"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="5ef30994f4778b4052e58a4383dbe7890048c87e"/>
   <project name="platform_hardware_ril" path="hardware/ril" remote="b2g" revision="8bc59310552179f9a8bc6cdd0188e2475df52fb7"/>
   <project name="platform_external_qemu" path="external/qemu" remote="b2g" revision="9d0e5057ee5404a31ec1bf76131cb11336a7c3b6"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="657894b4a1dc0a926117f4812e0940229f9f676f"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="34ea6163f9f0e0122fb0bb03607eccdca31ced7a"/>
   <!-- Stock Android things -->
   <project name="platform/abi/cpp" path="abi/cpp" revision="dd924f92906085b831bf1cbbc7484d3c043d613c"/>

--- a/b2g/config/flame-kk/sources.xml
+++ b/b2g/config/flame-kk/sources.xml
@@ -10,17 +10,17 @@
   <!--original fetch url was git://codeaurora.org/-->
   <remote fetch="https://git.mozilla.org/external/caf" name="caf"/>
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
   <project name="platform_build" path="build" remote="b2g" revision="e862ab9177af664f00b4522e2350f4cb13866d73">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
-  <project name="gaia" path="gaia" remote="mozillaorg" revision="862f0895f3f5a97200601542d99a152a46385a0b"/>
+  <project name="gaia" path="gaia" remote="mozillaorg" revision="21256d7665f972255d198f8af81a8df4bd0e0fc4"/>
   <project name="fake-libdvm" path="dalvik" remote="b2g" revision="d50ae982b19f42f0b66d08b9eb306be81687869f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="9f45c1988fe72749f0659409e6e3320fabf7b79a"/>
   <project name="librecovery" path="librecovery" remote="b2g" revision="1b3591a50ed352fc6ddb77462b7b35d0bfa555a3"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="657894b4a1dc0a926117f4812e0940229f9f676f"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="5ef30994f4778b4052e58a4383dbe7890048c87e"/>
   <project name="valgrind" path="external/valgrind" remote="b2g" revision="daa61633c32b9606f58799a3186395fd2bbb8d8c"/>
   <project name="vex" path="external/VEX" remote="b2g" revision="47f031c320888fe9f3e656602588565b52d43010"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="5bb657ada461be666c35f419dbe072ed2ce632fc"/>

--- a/b2g/config/gaia.json
+++ b/b2g/config/gaia.json
@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "862f0895f3f5a97200601542d99a152a46385a0b", 
+        "git_revision": "21256d7665f972255d198f8af81a8df4bd0e0fc4", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "b176b86e412fb3143fa31ced79faa5238d540f93", 
+    "revision": "5ec7add1a5ed54e7c57e9fd24704624a9e84139a", 
     "repo_path": "integration/gaia-central"
 }

--- a/b2g/config/nexus-4/sources.xml
+++ b/b2g/config/nexus-4/sources.xml
@@ -12,17 +12,17 @@
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
   <project name="platform_build" path="build" remote="b2g" revision="660169a3d7e034a892359e39135e8c2785a6ad6f">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="5ef30994f4778b4052e58a4383dbe7890048c87e"/>
   <project name="fake-libdvm" path="dalvik" remote="b2g" revision="d50ae982b19f42f0b66d08b9eb306be81687869f"/>
-  <project name="gaia" path="gaia" remote="mozillaorg" revision="862f0895f3f5a97200601542d99a152a46385a0b"/>
+  <project name="gaia" path="gaia" remote="mozillaorg" revision="21256d7665f972255d198f8af81a8df4bd0e0fc4"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="9f45c1988fe72749f0659409e6e3320fabf7b79a"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="657894b4a1dc0a926117f4812e0940229f9f676f"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="5bb657ada461be666c35f419dbe072ed2ce632fc"/>
   <project name="valgrind" path="external/valgrind" remote="b2g" revision="daa61633c32b9606f58799a3186395fd2bbb8d8c"/>
   <project name="vex" path="external/VEX" remote="b2g" revision="47f031c320888fe9f3e656602588565b52d43010"/>
   <!-- Stock Android things -->
   <project groups="linux" name="platform/prebuilts/clang/linux-x86/3.1" path="prebuilts/clang/linux-x86/3.1" revision="5c45f43419d5582949284eee9cef0c43d866e03b"/>
   <project groups="linux" name="platform/prebuilts/clang/linux-x86/3.2" path="prebuilts/clang/linux-x86/3.2" revision="3748b4168e7bd8d46457d4b6786003bc6a5223ce"/>

--- a/b2g/config/nexus-5-l/sources.xml
+++ b/b2g/config/nexus-5-l/sources.xml
@@ -10,17 +10,17 @@
   <!--original fetch url was git://codeaurora.org/-->
   <remote fetch="https://git.mozilla.org/external/caf" name="caf"/>
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
   <project name="platform_build" path="build" remote="b2g" revision="07c383a786f188904311a37f6062c2cb84c9b61d">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
-  <project name="gaia" path="gaia" remote="mozillaorg" revision="862f0895f3f5a97200601542d99a152a46385a0b"/>
+  <project name="gaia" path="gaia" remote="mozillaorg" revision="21256d7665f972255d198f8af81a8df4bd0e0fc4"/>
   <project name="fake-libdvm" path="dalvik" remote="b2g" revision="d50ae982b19f42f0b66d08b9eb306be81687869f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="9f45c1988fe72749f0659409e6e3320fabf7b79a"/>
   <project name="librecovery" path="librecovery" remote="b2g" revision="1b3591a50ed352fc6ddb77462b7b35d0bfa555a3"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="657894b4a1dc0a926117f4812e0940229f9f676f"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="5ef30994f4778b4052e58a4383dbe7890048c87e"/>
   <project name="valgrind" path="external/valgrind" remote="b2g" revision="daa61633c32b9606f58799a3186395fd2bbb8d8c"/>
   <project name="vex" path="external/VEX" remote="b2g" revision="47f031c320888fe9f3e656602588565b52d43010"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="5bb657ada461be666c35f419dbe072ed2ce632fc"/>

--- a/testing/mozharness/scripts/gaia_build_unit.py
+++ b/testing/mozharness/scripts/gaia_build_unit.py
@@ -26,24 +26,30 @@ class GaiaBuildUnitTest(GaiaTest):
         """
         dirs = self.query_abs_dirs()
 
         self.node_setup()
 
         output_parser = TestSummaryOutputParserHelper(
           config=self.config, log_obj=self.log_obj, error_list=self.error_list)
 
-        code = self.run_command([
+        cmd = [
             'make',
             'build-test-unit',
             'REPORTER=mocha-tbpl-reporter',
             'NODE_MODULES_SRC=npm-cache',
             'VIRTUALENV_EXISTS=1',
             'TRY_ENV=1'
-        ], cwd=dirs['abs_gaia_dir'],
+        ]
+
+        # for Mulet
+        if 'firefox' in self.binary_path:
+            cmd += ['RUNTIME=%s' % self.binary_path]
+
+        code = self.run_command(cmd, cwd=dirs['abs_gaia_dir'],
            output_parser=output_parser,
            output_timeout=330)
 
         output_parser.print_summary('gaia-build-unit-tests')
         self.publish(code)
 
 if __name__ == '__main__':
     gaia_build_unit_test = GaiaBuildUnitTest()

--- a/testing/mozharness/scripts/gaia_linter.py
+++ b/testing/mozharness/scripts/gaia_linter.py
@@ -113,29 +113,35 @@ class GaiaIntegrationTest(GaiaTest):
         # Copy the b2g desktop we built to the gaia directory so that it
         # gets used by the marionette-js-runner.
         self.copytree(
             os.path.join(os.path.dirname(self.binary_path)),
             os.path.join(dirs['abs_gaia_dir'], 'b2g'),
             overwrite='clobber'
         )
 
+        cmd = [
+            'make',
+            'lint',
+            'NODE_MODULES_SRC=npm-cache',
+            'VIRTUALENV_EXISTS=1'
+        ]
+
+        # for Mulet
+        if 'firefox' in self.binary_path:
+            cmd += ['RUNTIME=%s' % self.binary_path]
+
         self.make_node_modules()
 
         output_parser = GaiaLinterOutputParser(
             base_dir=dirs['abs_gaia_dir'],
             config=self.config,
             log_obj=self.log_obj)
 
-        code = self.run_command([
-            'make',
-            'lint',
-            'NODE_MODULES_SRC=npm-cache',
-            'VIRTUALENV_EXISTS=1'
-        ], cwd=dirs['abs_gaia_dir'],
+        code = self.run_command(cmd, cwd=dirs['abs_gaia_dir'],
            output_parser=output_parser,
            output_timeout=600)
 
         output_parser.print_summary('gaia-lint')
         self.publish(code)
 
 if __name__ == '__main__':
     gaia_integration_test = GaiaIntegrationTest()

--- a/testing/taskcluster/tasks/branches/base_jobs.yml
+++ b/testing/taskcluster/tasks/branches/base_jobs.yml
@@ -101,26 +101,30 @@ tests:
   gaia-build:
     allowed_build_tasks:
       tasks/builds/b2g_desktop_opt.yml:
         task: tasks/tests/b2g_build_test.yml
   gaia-build-unit:
     allowed_build_tasks:
       tasks/builds/b2g_desktop_opt.yml:
         task: tasks/tests/b2g_build_unit.yml
+      tasks/builds/mulet_linux.yml:
+        task: tasks/tests/mulet_build_unit.yml
   gaia-js-integration:
     allowed_build_tasks:
       tasks/builds/b2g_desktop_opt.yml:
         task: tasks/tests/b2g_gaia_js_integration_tests.yml
       tasks/builds/mulet_linux.yml:
         task: tasks/tests/mulet_gaia_js_integration_tests.yml
   gaia-linter:
     allowed_build_tasks:
       tasks/builds/b2g_desktop_opt.yml:
         task: tasks/tests/b2g_linter.yml
+      tasks/builds/mulet_linux.yml:
+        task: tasks/tests/mulet_linter.yml
   gaia-ui-test-accessibility:
     allowed_build_tasks:
       tasks/builds/b2g_desktop_opt.yml:
         task: tasks/tests/b2g_gaia_ui_test_accessibility.yml
       tasks/builds/b2g_desktop_debug.yml:
         task: tasks/tests/b2g_gaia_ui_test_accessibility.yml
   gaia-ui-test-functional:
     allowed_build_tasks:

--- a/testing/taskcluster/tasks/branches/try/job_flags.yml
+++ b/testing/taskcluster/tasks/branches/try/job_flags.yml
@@ -204,26 +204,30 @@ tests:
   gaia-build:
     allowed_build_tasks:
       tasks/builds/b2g_desktop_opt.yml:
         task: tasks/tests/b2g_build_test.yml
   gaia-build-unit:
     allowed_build_tasks:
       tasks/builds/b2g_desktop_opt.yml:
         task: tasks/tests/b2g_build_unit.yml
+      tasks/builds/mulet_linux.yml:
+        task: tasks/tests/mulet_build_unit.yml
   gaia-js-integration:
     allowed_build_tasks:
       tasks/builds/b2g_desktop_opt.yml:
         task: tasks/tests/b2g_gaia_js_integration_tests.yml
       tasks/builds/mulet_linux.yml:
         task: tasks/tests/mulet_gaia_js_integration_tests.yml
   gaia-linter:
     allowed_build_tasks:
       tasks/builds/b2g_desktop_opt.yml:
         task: tasks/tests/b2g_linter.yml
+      tasks/builds/mulet_linux.yml:
+        task: tasks/tests/mulet_linter.yml
   gaia-ui-test-accessibility:
     allowed_build_tasks:
       tasks/builds/b2g_desktop_opt.yml:
         task: tasks/tests/b2g_gaia_ui_test_accessibility.yml
       tasks/builds/b2g_desktop_debug.yml:
         task: tasks/tests/b2g_gaia_ui_test_accessibility.yml
   gaia-ui-test-functional:
     allowed_build_tasks:

new file mode 100644
--- /dev/null
+++ b/testing/taskcluster/tasks/tests/mulet_build_unit.yml
@@ -0,0 +1,39 @@
+---
+$inherits:
+  from: 'tasks/test.yml'
+task:
+  metadata:
+    name: '[TC] - Gaia Build Unit Test'
+    description: Gaia Build Unit Test
+
+  payload:
+    command:
+      - entrypoint
+      - ./bin/pull_gaia.sh &&
+      - >
+        python ./mozharness/scripts/gaia_build_unit.py
+        --application firefox
+        --no-read-buildbot-config
+        --config-file ./mozharness/configs/b2g/gaia_integration_config.py
+        --config-file ./mozharness_configs/gaia_integration_override.py
+        --config-file ./mozharness_configs/remove_executables.py
+        --no-pull
+        --download-symbols ondemand
+        --installer-url {{build_url}}
+        --test-packages-url {{test_packages_url}}
+        --gaia-repo https://hg.mozilla.org/integration/gaia-central
+        --gaia-dir /home/worker
+    artifacts:
+      'public/build':
+        type: directory
+        path: '/home/worker/artifacts/'
+        expires: '{{#from_now}}1 year{{/from_now}}'
+
+  extra:
+    treeherderEnv:
+      - production
+      - staging
+    treeherder:
+      groupSymbol: "?"
+      symbol: 'Gbu'
+      productName: b2g

new file mode 100644
--- /dev/null
+++ b/testing/taskcluster/tasks/tests/mulet_linter.yml
@@ -0,0 +1,38 @@
+---
+$inherits:
+  from: 'tasks/test.yml'
+task:
+  metadata:
+    name: '[TC] - Gaia Linter'
+    description: Linter Test
+
+  payload:
+    command:
+      - entrypoint
+      - ./bin/pull_gaia.sh &&
+      - >
+        python ./mozharness/scripts/gaia_linter.py
+        --application firefox
+        --no-read-buildbot-config
+        --config-file ./mozharness/configs/b2g/gaia_integration_config.py
+        --config-file ./mozharness_configs/gaia_integration_override.py
+        --download-symbols ondemand
+        --no-pull
+        --installer-url {{build_url}}
+        --test-packages-url {{test_packages_url}}
+        --gaia-repo https://hg.mozilla.org/integration/gaia-central
+        --gaia-dir /home/worker
+    artifacts:
+      'public/build':
+        type: directory
+        path: '/home/worker/artifacts/'
+        expires: '{{#from_now}}1 year{{/from_now}}'
+
+  extra:
+    treeherderEnv:
+      - production
+      - staging
+    treeherder:
+      groupSymbol: "?"
+      symbol: 'Li'
+      productName: 'b2g'