

Mozilla, though getting funding from Google to make google its default search engine, officially decided to keep supporting Manifest v2.
For now. Google probably isn’t too concerned since they have a more than 70% market share, and nearly 90% if you count all Chromium-based browsers. Firefox has managed to do what Google wants, which is “exist” and “not meaningfully compete with Chrome”. If that changes, Google might lean on them harder.
Do you mean “almost completely”?