I've just tested it, still working. Mind you I'm using Firefox 61 (current version is 63). I switched off auto-updates when it kept changing my user interface

I've just tested it, still working. Mind you I'm using Firefox 61 (current version is 63). I switched off auto-updates when it kept changing my user interface and trashing the extensions I need to use to make the web half-usable (e.g. Adblock Plus, Bypass Paywalls, Disable Javascript, Font Contrast Fix, Stylish). I'm guessing Firefox 63 doesn't let you run Bypass Paywalls, then? I suspect if fucks up other stuff, though I'm not trying it to find out. If Firefox want to increase their market share, a good start would be not to make changes that are actively hostile to the user.