That happens quite often these days. Last week I was filling in a govt form (EU country), submit button didn't work in FF, so I had to resort to using Microsoft Chrome. On my company's training platform videos aren't rendered in FF. Another shitty corporate portal which shows my salary and holidays doesn't work in FF at all, completely. What else... A few smaller payment providers weren't working in FF over past two years. Ghost of the Skype before being finally killed only worked in Chrome clones. Stadia only worked in Chrome (yes, I used it and it was fine).

Also many sites show significant degradation in FF lately. Youtube works like shit in FF, once every 10 page opens it just gets stuck half way with part of the background loaded, like black with black empty frames on top. Or just empty page. No, it never finishes loading from that state, and neither it can reload on F5. But opening a new tab works fine and YT loads normally.

And to finish off this rant, FF has now started corrupting my open tabs after opening FF with saved session. This never happened since this feature was implemented and in 2025 has happened 3 times already. And in mozilla bugtracker all tickets about this are ignored for years now. Meanwhile they are developing some crappy bells and whistles, instead of fixing fundamental bugs.

If not for Chrome monopoly, I would consider switching browsers. Ladybird can't come soon enough. Mozilla has lost touch with reality.