I gave Firefox a try for a month, but ran into enough issues that I ended up switching back to Chrome about a week ago. Here are some of the problems I encountered that I can recall at the moment and doesn't include the many issues I managed to fix:

Copying content doesn’t always work on certain sites. For example, you can't copy an image from Photopea.com, which I rely on frequently. Saving the image to a file instead slows down my workflow too much. This is a known bug which has been around for a long time.

Password autofill was inconsistent. It didn’t work on some sites, like when accessing a Pi-hole dashboard. Maybe there’s an about:config tweak to fix this, but by that point I had already spent a lot of time troubleshooting other issues.

The bookmark menu closes after opening a single bookmark. If you like opening multiple bookmarks in a row, you have to keep reopening the menu and navigating to the next one each time, which is frustrating.

Twitch videos loaded slowly. I managed to fix this by deleting a specific file, re-creating it as a blank file, and setting it to read-only. This appears to be a known bug the developers are aware of.

Loading custom extensions is inconvenient. You can only load them temporarily unless you launch Firefox with a command-line option for each extension.