This prompted me to check LinkedIn after months of having it parked in a tab and it worked with no problems.

When I have problems with a site it's usually because I'm blocking most JavaScript with uMatrix and I have to find the correct combination of scripts to make the site work for me without having to give away my soul to the gods of tracking.

As a software developer, it's been years since a customer told me that the sites I develop on Firefox don't work on Chrome or Safari. I don't even bother to check anymore. I couldn't check with Safari anyway and they are OK with that. The point is that if it works in Firefox it works everywhere. Of course we're not using any Chrome-only API but we never had to use one of them as far as I can remember.