While firefox will alert me to avaiable updated extensions when I proceed to update all I get for my troubles: (the below example is for adblock, but also happens to the only other extension I have which is stumbleupon) Firefox could not install the file at http://releases.mozilla.org/pub/mozilla.org/addons/1865/adblock_plus-1.2.2-fx+sm+tb+fn.xpi because: Download error -228 Searched for Download error -228 but could not find out what the error actually is.