I'm a long time user of uBlockOrigin on Firefox, but for some reason, today it is no longer working at all. Nothing is blocked, it is impossible to access extension settings, pages are the same with and without the extension enabled, etc. Even the icon in the menu bar is different from before for some reason.
It seems like an update to FF and/or uBO must have broken things (my guess is the former), but I haven't been able to find any other reports of the same issue.
Apart from extensions no longer working, there are several sites I've noticed that constantly crash the tab now (this happens whether or not ubo is enabled, but it does seem to work in a private browsing window).