Seems like Microsoft is just taking whatever Chromium releases and repackages it to show more ads and to make Bing the default search engine. In this case, it's just dropping support for Manifest V2 extensions, such as uBlock Origin, and moving to Manifest V3, which does not support extensions intercepting and blocking requests using blockingWebRequest.
Just three days ago, Mozilla reiterated [1] that Firefox would continue to support Manifest V2 alongside Manifest V3. So if you want a better web experience with uBlock Origin, Firefox is your only choice (or use Firefox forks that support it). While you're at it, note that "uBlock Origin works best on Firefox". [2]
Just three days ago, Mozilla reiterated [1] that Firefox would continue to support Manifest V2 alongside Manifest V3. So if you want a better web experience with uBlock Origin, Firefox is your only choice (or use Firefox forks that support it). While you're at it, note that "uBlock Origin works best on Firefox". [2]
[1]: https://blog.mozilla.org/en/products/firefox/firefox-manifes...
[2]: https://github.com/gorhill/uBlock/wiki/uBlock-Origin-works-b...