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• Today I had the chance to check this again, as I got into this problem when I tried to install the LibreOffice plugin for my iMac (Intel Core 2 Duo, 2006, OSX 10.6.8). I confirm that it was Adblock Plus 2.6.7.

  in Can't install LibreOffice Plugin 3.5.9 (Firefox extension) Comment by hakase February 8, 2015
• >>>I assume that's what you're doing, but just in case: the way to go is to re-enable them one-by-one and see if one of them breaks this (it's possible none will). That's what I was doing, but I did something during the process that disable…

  in Can't install LibreOffice Plugin 3.5.9 (Firefox extension) Comment by hakase December 9, 2014
• Wow, disabling all of Firefox add-ons solved the problem!! Thank you so much for your quick help! I'm now trying to figure out which add-on was the problem.

  in Can't install LibreOffice Plugin 3.5.9 (Firefox extension) Comment by hakase December 9, 2014