Mozilla will support the APIs specified in MV3 to allow porting Chrome extensions easily. This does not mean they cannot offer other APIs.
And they have officially stated that they will continue to support the content-blocking API from MV2, for at least as long as there is no appropriate replacement.
Mozilla will support the APIs specified in MV3 to allow porting Chrome extensions easily. This does not mean they cannot offer other APIs.
And they have officially stated that they will continue to support the content-blocking API from MV2, for at least as long as there is no appropriate replacement.
See the “WebRequest” section here: https://blog.mozilla.org/addons/2022/05/18/manifest-v3-in-firefox-recap-next-steps/
Specifically, FF will maintain support for blocking WebRequest in MV3. And that means ad blockers can still be injected before content is rendered.