@WordsmithFL
I'm on FF also (on Linux Mint DE). I haven't noticed any issues with CoSo, but my extensions and settings do cause some issues with some sites. I do not have other browsers installed.
@WordsmithFL
It might also be some extensions you have installed on FF. I've had to disable all the ad blocker ones for a couple sites to work. If you're comfortable doing a fresh FF install you can give it a try.
@snyde21 Thank you. I wonder if I should just uninstall FF and then reinstall it to see if that resolves the problems.