apparently firefox got an update recently and i just got done updating my add-ons and learned of something that could pose a problem.
https://support.mozilla.org/en-US/kb/firefox-add-technology-modernizing?as=u&utm_source=inproduct
might want to check which of the add-ons you guys are using to know which are or aren't updating for this change.
out of those i updated just now, Ublock origin, self-destructing cookies, and that exhentai 2 add-on all have the legacy label (disconnect is fine as it didn't have the legacy label) so unless they update to this new web extension thing before they do the firefox 57 update this november, they won't work anymore according to that page.
Updated by Mantikor