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Wow, I had a problem with FF 89 in Fluxbox (in one of my Arch installations), sounds like what the OP saw in Openbox and reported in this thread: https://bbs.archlinux.org/viewtopic.php?id=267158
I replied in that thread ("MALsPa", post #3). I hope the "fix" that worked for me also works for the OP. However, FF 89 rendered fine for me in Openbox. This is weird.
Oh, I wasn't making any slurs against Chromium, particularly Vivaldi, which seems to have been well thought out by its developer.
Now, Chrome or Chrome-based... hmm... not for me. Too many Google tentacles involved.
Well you can definitely look at Webkit browsers like Midori andd Otter Browser then. Call me a conformist, but I don't see the problem if you take a FOSS engine like Chromium and put in your own privacy and sync controls. That is what Vivaldi has done. Webkit uses Safari based code so I guess that is pandering to Apple.
Note: I use Firefox all the time both in Windows and Linux.