Zotero has disappered

Zotero has disappered from my firefox and I cannot install it again. When I try to install it I get the message the zotero extension is broken. What should I do?
I try to work with standalone but cannot figure out how to receive references from on-line. And any extension I try to install (word-in extension has also disappeared) I get the same message, that the extension is broken.
Please help me, or I need to switch to another programme.
  • this sounds very much like a Firefox problem, so you should ask on their support as well.
    There is a good chance this can be fixed in your existing Firefox profile, but you could also create a new, separate, one (don't delete the broken one - it has all your Zotero data):
    http://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles
    and Zotero should install there.
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