Release notes for Bug-1381580 multiple locales fallbacks#39188
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pepelsbey merged 2 commits intomdn:firefox/139from Apr 18, 2025
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| ## Changes for add-on developers | ||
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| - Localized extensions now cascade through locale subtags to find translations before reverting to the extension's default language. Previously, the extension used the extension default if a translation couldn't be found for a language with subtags (such as `en-GB` or `zh-Hans-CN`). Take an extension with the default of Spanish (`es`) and a translation for English (`en`) installed by a user who has chosen British English (`en-GB`) as their browser locale. Previously, the user was served the default (Spanish) translation. After this change, the user is served the English (`en`) translation. ([Firefox bug 1381580](https://bugzil.la/1381580)) |
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This is a lot of text. Can it be shorter and link to the main documentation for further reference?
Rob--W
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* Add Firefox 139 release notes page * Release notes for Bug-1381580 multiple locales fallbacks (#39188) * Bug-1792685 Content scripts and styles guaranteed execution order release note (#39245) * FF139 Relnote: HTMLDialogElement.requestClose() (#39362) * FF139 Relnote: HTMLDialogElement.requestClose() * Update files/en-us/mozilla/firefox/releases/139/index.md --------- Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org> * FF139 Relnote - Escape < and > in attributes when serializing HTML (#39364) * FF139 Relnote: ExprFeat Escape < and > in attributes when serialize HTML * Apply suggestions from code review Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org> --------- Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org> * FF139Relnote - Reenable Prioritized Scheduling API (#39395) * FF139Relnote: Expr reenable Prioritized Scheduling API * Update files/en-us/mozilla/firefox/releases/139/index.md Co-authored-by: Brian Smith <brian@smith.berlin> --------- Co-authored-by: Brian Smith <brian@smith.berlin> * Ff139 unship (before/after)scriptexecute in nightly (#39391) * FF139 Relnote/Exp - unship (before/after)scriptexecute events * Update files/en-us/mozilla/firefox/releases/139/index.md Co-authored-by: Brian Smith <brian@smith.berlin> --------- Co-authored-by: Brian Smith <brian@smith.berlin> * tabGroups API release note (#39430) * tabGroups API * Revert "tabGroups API" This reverts commit 561bd38. * tabGroups API * Feedback update * Remove indication of user release version Co-authored-by: Rob Wu <rob@robwu.nl> * Removed indication of user shipped version Co-authored-by: Rob Wu <rob@robwu.nl> --------- Co-authored-by: Rob Wu <rob@robwu.nl> * 39303 ship temporal ff release (#39520) * Added Firefox release note for Temporal API * added firefox release notes for the Temporal API * FF139 Relnote: WebAuthn Extn largeBlob, credProps, prf (#39572) * FF139 Relnote: WebAuthn Extn largeBlob, credProps, prf * Update files/en-us/mozilla/firefox/releases/139/index.md Co-authored-by: Brian Smith <brian@smith.berlin> --------- Co-authored-by: Brian Smith <brian@smith.berlin> * docs(Fx139): Add relnote for hidden until found, beforematch (#39590) * docs(Fx139): Add relnote for hidden until found, beforematch * Update files/en-us/mozilla/firefox/releases/139/index.md Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org> --------- Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org> * added experimental release note for view transition api (#39588) * added experimental release note for view transition api * Update files/en-us/mozilla/firefox/experimental_features/index.md Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org> * Update files/en-us/mozilla/firefox/releases/139/index.md Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org> --------- Co-authored-by: Brian Smith <brian@smith.berlin> Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org> * WebDriver conformance changes for Firefox 139 (#39599) --------- Co-authored-by: Vadim Makeev <vmakeev@mozilla.com> Co-authored-by: rebloor <git@sherpa.co.nz> Co-authored-by: Hamish Willee <hamishwillee@gmail.com> Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org> Co-authored-by: Rob Wu <rob@robwu.nl> Co-authored-by: Dave Letorey <dave@code-red.uk> Co-authored-by: Henrik Skupin <mail@hskupin.info>
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Description
Provides a release note for Bug 1381580 "Support multiple fallback locales in i18n API". This change amended the way that localized extensions identified a translation string by cascading through region, language, and then extension default.
Content changes in #39013