[nneonneo]

In regards to extensions: it is my understanding that WebExtensions were never sold as being capable of as much as XUL addons, because XUL addons could rewrite just about anything in the browser and cause just about unlimited breakage. The XUL API could not be flexibly improved, and critically held back some real security improvements like multi-process rendering. It was ultimately _necessary_ to redesign the API in order to make it feasible to evolve the browser without constantly breaking addons. Please read https://yoric.github.io/post/why-did-mozilla-remove-xul-addo... for a more in-depth explanation.

[Seb-C]

I remember reading some ticket pages at the release, where they actually made promises about bringing the capabilities back in the future. But TBH I could not retrieve any link.

I know this story already, but as much as I can empathize with this since I am a developer myself, from a user point of view they destroyed the ecosystem that was their strength. When I said "bring back", I do not mean XUL as a technology, I mean the functionalities that the extensions could use.

I was on Firefox because it brought me something more, and because I appreciated it as it was. But now that they dumbed it down and made it like Google Chrome rather than focusing on their strengths, I do not have any good reason to use it. Because the many Chromium-based alternatives are better, more innovative, more reliable, and their UIs are stable and does not change every 6 months.