I'm almost done with Firefox (but it's not really FF's fault)

Not a week goes by where I don't run into some issue with a website that only occurs in Firefox but not in Chrome.

Latest example: Dragging & dropping help center homepage sections in Intercom is broken in Firefox but works flawlessly in Chrome.

A previous example: Pressing Esc while editing a checklist item on a Trello card closed out the card entirely instead of just exiting the checklist item. Again, this only happened in Firefox, not in Chrome. Trello support acknowledged and fixed the issue after several months.

Stuff like this has been happening so often over the last year or two that I'm starting to seriously consider moving to Chrome or some other Chromium-based browser.

I think this might not actually be FF's direct fault but rather be due to Firefox's declining market share. That makes it increasingly easy for web devs to justify ignoring Firefox and only develop and test on Chrome (and probably Safari). And apparently the implementation of some more intricate features, especially where JS is involved, is different enough across browsers that a feature working in Chrome doesn't guarantee that it will work in FF.

It's a shame, really. I'd love to stick to FF, but it's increasingly slowing me down and annoying me and my patience is running out.