RN for browser_specific_settings.gecko unrecognized property support

files/en-us/mozilla/firefox/releases/128/index.md

@@ -81,6 +81,7 @@ This article provides information about the changes in Firefox 128 that affect d
 - Support is now provided for scripts to run in the web page execution environment. This is provided through support for `MAIN` in {{WebExtAPIRef("scripting.executionWorld","ExecutionWorld")}} for the {{WebExtAPIRef("scripting")}} API, the addition of `world` to the {{WebExtAPIRef("contentScripts.register()")}} API, and support for `world` in the [`content_scripts`](/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/content_scripts) manifest key ([Firefox bug 1736575](https://bugzil.la/1736575)).
 - The {{WebExtAPIRef("scripting")}} API can now inject scripts and CSS into sandboxed pages with `about:blank`, `about:srcdoc`, and `data:` URLs. This was implemented for {{WebExtAPIRef("scripting.executeScript")}}, {{WebExtAPIRef("scripting.insertCSS")}}, and {{WebExtAPIRef("scripting.removeCSS")}} in [Firefox bug 1475831](https://bugzil.la/1475831) and {{WebExtAPIRef("scripting.registerContentScripts")}} and {{WebExtAPIRef("scripting.updateContentScripts")}} in [Firefox bug 1853411](https://bugzil.la/1853411) through the introduction of `matchOriginAsFallback` to {{WebExtAPIRef("scripting.RegisteredContentScript")}}.
 - The [manifest key `content_scripts`](/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/content_scripts) now supports `match_origin_as_fallback` and {{WebExtAPIRef("contentScripts.register")}} `matchOriginAsFallback`, enabling scripts to be injected into `about:`, `data:`, and `blob:` pages when the document origin is opaque due to the use of CSP or iframe sandbox ([Firefox bug 1475831](https://bugzil.la/1475831) and [Firefox bug 1896669](https://bugzil.la/1896669)). In addition, scripts registered with the `content_scripts` manifest key can now only run in `blob:` pages when `match_origin_as_fallback` is `true` ([Firefox bug 1897113](https://bugzil.la/1897113)).
+- Extensions containing an unrecognized property in [manifest key `browser_specific_settings.gecko`](/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/browser_specific_settings) now load. This ensures that if a new `browser_specific_settings.gecko` property is added, extensions using that new property will load in versions of Firefox back to this release ([Firefox bug 1757293](https://bugzil.la/1757293)).
 
 ### Removals