Upgrade Storage"The add-on could not be downloaded because of the connection failure on zotero.org"
^This is the notification I get from Firefox every time I try to download the Zotero browser extension for Firefox. I've installed Zotero standalone but I can't start using it without this extension. I've been trying to download the extension for weeks now, but I always get this note, so it's not about some temporary connection problems. Any idea what this is about? My Firefox version is 33.1
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See Step 5 on https://www.zotero.org/support/kb/ssl_certificate_error and let us know what it says.
http://imagizer.imageshack.us/v2/623x661q90/661/U64AXc.png
If you're using Avast, try temporarily disabling parts of it that seem to directly refer to the browser (I'd expect them to say something about SSL, but hard to say, we've never seen that).
If you're not using Avast, this may point to an infection in your computer.
See Step 5 on https://www.zotero.org/support/kb/ssl_certificate_error and let us know what it says.