--- a/taskcluster/ci/build/linux.yml
+++ b/taskcluster/ci/build/linux.yml
@@ -720,17 +720,17 @@ linux64-jsdcov/opt:
     description: "Linux64-JSDCov Opt"
     index:
         product: firefox
         job-name: linux64-jsdcov-opt
     treeherder:
         platform: linux64-jsdcov/opt
         symbol: B
         tier: 2
-    run-on-projects: ['mozilla-central', 'try']
+    run-on-projects: []
     worker-type: aws-provisioner-v1/gecko-{level}-b-linux
     worker:
         max-run-time: 36000
     run:
         using: mozharness
         actions: [get-secrets build check-test update]
         config:
             - builds/releng_base_firefox.py
@@ -749,17 +749,17 @@ linux64-ccov/opt:
     description: "Linux64-CCov Opt"
     index:
         product: firefox
         job-name: linux64-ccov-opt
     treeherder:
         platform: linux64-ccov/opt
         symbol: B
         tier: 2
-    run-on-projects: ['mozilla-central', 'try']
+    run-on-projects: []
     worker-type: aws-provisioner-v1/gecko-{level}-b-linux
     worker:
         max-run-time: 36000
     run:
         using: mozharness
         actions: [get-secrets build check-test update]
         config:
             - builds/releng_base_firefox.py

--- a/taskcluster/ci/build/windows.yml
+++ b/taskcluster/ci/build/windows.yml
@@ -494,17 +494,17 @@ win64-ccov/debug:
         using: mozharness
         options: [append-env-variables-from-configs]
         script: mozharness/scripts/fx_desktop_build.py
         config:
             - builds/releng_base_firefox.py
             - builds/taskcluster_base_windows.py
             - builds/taskcluster_base_win64.py
             - builds/taskcluster_sub_win64/ccov_debug.py
-    run-on-projects: ['mozilla-central', 'try']
+    run-on-projects: []
     toolchains:
         - win64-clang-cl
         - win64-rust
         - win64-sccache
 
 win64-asan/debug:
     description: "Win64 Debug ASAN"
     index:

--- a/taskcluster/taskgraph/transforms/tests.py
+++ b/taskcluster/taskgraph/transforms/tests.py
@@ -706,30 +706,38 @@ def handle_suite_category(config, tests)
 @transforms.add
 def enable_code_coverage(config, tests):
     """Enable code coverage for the linux64-ccov/opt & linux64-jsdcov/opt & win64-ccov/debug
     build-platforms"""
     for test in tests:
         if 'ccov' in test['build-platform'] and not test['test-name'].startswith('test-verify'):
             test['mozharness'].setdefault('extra-options', []).append('--code-coverage')
             test['instance-size'] = 'xlarge'
+            # Ensure we don't run on inbound/autoland/beta, but if the test is try only, ignore it
+            if 'mozilla-central' in test['run-on-projects'] or \
+                    test['run-on-projects'] == 'built-projects':
+                test['run-on-projects'] = ['mozilla-central', 'try']
 
             if 'talos' in test['test-name']:
                 test['max-run-time'] = 7200
                 if 'linux' in test['build-platform']:
                     test['docker-image'] = {"in-tree": "desktop1604-test"}
                 test['mozharness']['extra-options'].append('--add-option')
                 test['mozharness']['extra-options'].append('--cycles,1')
                 test['mozharness']['extra-options'].append('--add-option')
                 test['mozharness']['extra-options'].append('--tppagecycles,1')
                 test['mozharness']['extra-options'].append('--add-option')
                 test['mozharness']['extra-options'].append('--no-upload-results')
                 test['mozharness']['extra-options'].append('--add-option')
                 test['mozharness']['extra-options'].append('--tptimeout,15000')
         elif test['build-platform'] == 'linux64-jsdcov/opt':
+            # Ensure we don't run on inbound/autoland/beta, but if the test is try only, ignore it
+            if 'mozilla-central' in test['run-on-projects'] or \
+                    test['run-on-projects'] == 'built-projects':
+                test['run-on-projects'] = ['mozilla-central', 'try']
             test['mozharness'].setdefault('extra-options', []).append('--jsd-code-coverage')
         yield test
 
 
 @transforms.add
 def handle_run_on_projects(config, tests):
     """Handle translating `built-projects` appropriately"""
     for test in tests: