I've been sent a possible solution to the problem:
addons.mozilla.org/en-US/firefox/addon/invisiblehand/
This will disable add-on signature enforcement; Enter about:config into your Firefox address bar Click the I'll be careful button Find xpinstall.signatures.required in the list Right click the preference Select Toggle until the value is false support.mozilla.org/en-US/kb/add-on-signing-in-firefox
wiki.mozilla.org/Firefox/AddOns/Status/Updates#Exec_Summary “Currently targeting Signing with no pref to turn off in Firefox 47â€
This is way beyond my expertise, is it likely to cause any problems?
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