At my current gig, it's WebEx. The Linux client supposedly does work on 32-bit FireFox using 32-bit Java. I've tried some docker containers that supposedly support this configuration, but so far I can't get anything to work.

WebEx is literally the only reason I even start up a Windows VM at work.

When I worked in a WebEx shop, I gave up on the Linux/Firefox situation and just used their Android client on a tablet or phone.