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Bug-1792685 Content scripts and styles guaranteed execution order release note #39245

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rebloor merged 1 commit into from
Apr 29, 2025
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Bug-1792685 Content scripts and styles guaranteed execution order release note #39245

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1 change: 1 addition & 0 deletions files/en-us/mozilla/firefox/releases/139/index.md
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Expand Up @@ -58,6 +58,7 @@ This article provides information about the changes in Firefox 139 that affect d
## Changes for add-on developers

- 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. See [Localized string selection](/en-US/docs/Mozilla/Add-ons/WebExtensions/Internationalization#localized_string_selection) in the Internationalization article for more details of the new behavior. ([Firefox bug 1381580](https://bugzil.la/1381580))
- Content scripts and styles are now guaranteed to execute in the order of registration (i.e., their order in the [`content_scripts` manifest key array](/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/content_scripts)). Previously, the order was only guaranteed for scripts within the same `js` array. ([Firefox bug 1792685](https://bugzil.la/1792685))

### Removals

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