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Working newly under windows 7, suddenly I cannot install or activate addons any more.

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After having installed Windows 7 Prof on a new desktop PC, I also installed Firefox with (almost) the same addons as on my old PC. Initially all went OK, but a week ago I realised. that my addons did not function any more. I was able to deactivate them, even to deinstall and install them again, but not to activate them