--- a/_configs/browser.toml
+++ b/_configs/browser.toml
@@ -84,16 +84,17 @@ locales = [
     "pa-IN",
     "pl",
     "pt-BR",
     "pt-PT",
     "rm",
     "ro",
     "ru",
     "sat",
+    "sc",
     "scn",
     "sco",
     "si",
     "sk",
     "sl",
     "son",
     "sq",
     "sr",

new file mode 100644
--- /dev/null
+++ b/mail/messenger/migration.ftl
@@ -0,0 +1,14 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, you can obtain one at http://mozilla.org/MPL/2.0/.
+
+migration-progress-header = Getting { -brand-short-name } ready…
+
+## Migration tasks
+
+# These strings are displayed to the user if a migration is taking a long time.
+# They should be short (no more than a handful of words) and in the present tense.
+
+migration-task-test-fast = Testing a fast change
+migration-task-test-slow = Testing a slow change
+migration-task-test-progress = Testing the progress bar

--- a/toolkit/toolkit/about/aboutProcesses.ftl
+++ b/toolkit/toolkit/about/aboutProcesses.ftl
@@ -59,16 +59,17 @@ about-processes-preallocated-process = P
 about-processes-unknown-process = Other: { $type } ({ $pid })
 
 ## Isolated process names
 ## Variables:
 ##    $pid (String) The process id of this process, assigned by the OS.
 ##    $origin (String) The domain name for this process.
 
 about-processes-web-isolated-process = { $origin } ({ $pid })
+about-processes-web-serviceworker = { $origin } ({ $pid }, serviceworker)
 about-processes-web-large-allocation-process = { $origin } ({ $pid }, large)
 about-processes-with-coop-coep-process = { $origin } ({ $pid }, cross-origin isolated)
 about-processes-web-isolated-process-private = { $origin } — Private ({ $pid })
 about-processes-web-large-allocation-process-private = { $origin } — Private ({ $pid }, large)
 about-processes-with-coop-coep-process-private = { $origin } — Private ({ $pid }, cross-origin isolated)
 
 ## Details within processes
 

--- a/toolkit/toolkit/global/processTypes.ftl
+++ b/toolkit/toolkit/global/processTypes.ftl
@@ -24,16 +24,20 @@ process-type-file = Local File
 # process used to isolate webpages that requested special
 # permission to allocate large amounts of memory
 process-type-weblargeallocation = Large Allocation
 
 # process used to isolate a webpage from other web pages
 # to improve security
 process-type-webisolated = Isolated Web Content
 
+# process used to isolate a ServiceWorker to improve
+# performance
+process-type-webserviceworker = Isolated Service Worker
+
 # process preallocated; may change to other types
 process-type-prealloc = Preallocated
 
 ##
 ## Localization for Gecko process types defined in GeckoProcessTypes.h
 ##
 
 process-type-default = Main

--- a/toolkit/toolkit/global/unknownContentType.ftl
+++ b/toolkit/toolkit/global/unknownContentType.ftl
@@ -7,8 +7,36 @@ unknowncontenttype-handleinternally =
     .accesskey = e
 
 unknowncontenttype-settingschange =
     .value =
         { PLATFORM() ->
             [windows] Settings can be changed in { -brand-short-name }’s Options.
            *[other] Settings can be changed in { -brand-short-name }’s Preferences.
         }
+
+unknowncontenttype-intro = You have chosen to open:
+unknowncontenttype-which-is = which is:
+unknowncontenttype-from = from:
+unknowncontenttype-prompt = Would you like to save this file?
+unknowncontenttype-action-question = What should { -brand-short-name } do with this file?
+unknowncontenttype-open-with =
+    .label = Open with
+    .accesskey = O
+unknowncontenttype-other =
+    .label = Other…
+unknowncontenttype-choose-handler =
+    .label =
+        { PLATFORM() ->
+            [macos] Choose…
+           *[other] Browse…
+        }
+    .accesskey =
+        { PLATFORM() ->
+            [macos] C
+           *[other] B
+        }
+unknowncontenttype-save-file =
+    .label = Save File
+    .accesskey = S
+unknowncontenttype-remember-choice =
+    .label = Do this automatically for files like this from now on.
+    .accesskey = a