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Invisible Hand no longer works even after disabling ad blocker plus.

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Invisible Hand appeared to stop working, so I re-loaded it and re-booted my PC, to no avail. I disabled Adblock Plus in case that was the cause, but all that did was slow everything down and produce loads of adverts. I then tried Price Goblin, again re-booting, but that doesn't work either. These are the only three add-ons I have installed. Can anyone suggest a cure please?

Invisible Hand appeared to stop working, so I re-loaded it and re-booted my PC, to no avail. I disabled Adblock Plus in case that was the cause, but all that did was slow everything down and produce loads of adverts. I then tried Price Goblin, again re-booting, but that doesn't work either. These are the only three add-ons I have installed. Can anyone suggest a cure please?

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https://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 https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox

https://wiki.mozilla.org/Firefox/AddOns/Status/Updates#Exec_Summary “Currently targeting Signing with no pref to turn off in Firefox 47”