Microsoft's Edge browser moving to Chromium

Let users easily resize badly laid out pages.
Let users easily fix broken low-contrast designs.
Let users stop carousels (these are on the way out finally) or autoplay videos.

There are so many easy wins, but Firefox is not pursuing them.

Heck Firefox/Mozilla *never* addressed the single most popular ever ticket in bugzilla, the request to use external editors for textareas and similar. In fact, they killed the sane solutions for this that grew up in the extensions space.

There's a lot of room to make a better browser for users, and they aren't really trying.