User blog comment:MisterWoodhouse/Updates to Discussions and the plan for Forums/@comment-35455167-20200807005019/@comment-1824272-20200811214853

Oof, yeah, Firefox 45.9 ESR... We're up to Firefox 79 😅

It's definitely down to using a browser that's over 30 release versions old. Hopefully you'll be able to upgrade to a newer system with the newer browser updates, but until then, yeah I wouldn't really expect anything to work at all.