Maybe these extensions will be remade and repackaged with web-extensions then (afaik it’s a good move, yet breaking all the old apps forever is bad, they should re-integrate it after I while I’d personally prefer).
Waiting for this, XUL extensions I install through Debian on stable are perfectly working (maybe if they, dunno, keep easy for distros like debian to patch firefox in order to keep XUL support some time that’d help?), so that’s probably for a too recent, or even future, version that XUL doesn’t work anymore…
