Firefox was dumbed down when they ditched XUL and followed Chrome's lead. Hopefully they will see the light and add more power to the extensions than Google will ever let Chrome have.
Still waiting for a non-hacky way to hide the tab bar.
Still waiting for a non-hacky way to hide the tab bar.
WebExtensions also had the Chrome interop advantage, so more actively maintained extensions would be brought over, especially well-supported AAA extensions. As a result, it wasn't a net loss and longterm definitely a gain.
Mozilla for their part did say they would work with folks to poke additional holes in the WebExtensions API that would be Firefox-only, for extensions that had enough outcry behind them.
I'm pleased with where Firefox is today, but I never felt it was behind enough on performance and definitely never enough on features to leave.