Ad-on not accepted
After Firefox crashed a number of times in quick succession, I got it up and working again. However, the Dashlane ad-on/extension had disappeared. When trying to re-install it, I get the message:" The ad-on could not be installed, because it did not match the ad-0n Firefox expected.(ses screenshot). I would appreciate any help I can get to solve the problem, as Dashlane is not functioning right now.