I really, really wanted to switch, but I saw that switching tabs with mousewheel (which can be done in Chrome and most other Linux apps) is still not possible,

I really, really wanted to switch, but I saw that switching tabs with mousewheel (which can be done in Chrome and most other Linux apps) is still not possible, and the Tab Wheel Scroll extension, which I previously used to work around the issue, is no longer compatible. So Firefox is unfortunately an unusable web browser for me :/