Manifest V3 updates landed in Firefox 128
Firefox 128 introduces Manifest V3 updates for cross-browser compatibility, focusing on content scripts and scripting API improvements. Deprecated Web API events must be removed before Firefox 131. MV3 APIs are backported to MV2 for easier transition. Android permissions UI enhances optional permissions control.
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The release of Firefox 128 includes Manifest V3 updates focusing on cross-browser compatibility, particularly regarding content scripts and the scripting API. Support for the MAIN execution world for content scripts and scripting.executeScript has been added, allowing extensions to inject scripts into web pages without being blocked by strict webpage CSP. Deprecated non-standard Web API events overflow and underflow must be removed from extensions before Firefox 131. To aid developers, MV3 APIs have been backported to MV2, easing the transition. Despite being features supported for MV3 in Chrome, Firefox 128 supports MAIN world and match_origin_as_fallback for MV2. Additionally, the Android permissions UI in Firefox 128 enables better control over optional permissions, fully supporting MV3 on Firefox for Android. Developers are encouraged to refer to release notes for all changes in Firefox 128 and a migration guide for adopting MV3.
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