For now using Firefox ESR might be a good stopgap measure for you?
That way you can use an old version with the old add-on ecosystem for at least a year longer, and still get security updates.
I usually work on Debian Jessie which ships (a variant of) Firefox ESR, and it's very well-usable. I haven't noticed any differences between the latest Firefox on Windows and Firefox-ESR on Debian.
The latest LastPass, XMarks, VimFX, uBlock Origin and uMatrix run on it, though I haven't managed to get RES (Reddit Enhancement Suite) to work.
That way you can use an old version with the old add-on ecosystem for at least a year longer, and still get security updates.
I usually work on Debian Jessie which ships (a variant of) Firefox ESR, and it's very well-usable. I haven't noticed any differences between the latest Firefox on Windows and Firefox-ESR on Debian.
The latest LastPass, XMarks, VimFX, uBlock Origin and uMatrix run on it, though I haven't managed to get RES (Reddit Enhancement Suite) to work.