Reverse or stop upgrade to v. 2

When I started Firefox, I got a notice that an update to zotero is available. I clicked on OK and a new version was uploaded. After reading about it, I decided I do not want to upgrade at this time as I am in the middle of preparing a proposal.

Apparently I need to restart Firefox for the update to finish. How can I stop the upgrade? A quick answer would help since I won't restart until I get an answer :-)

If I can't stop the upgrade, how do I re-install my previous version (the latest version of 1.x I assume)? I have backed up the directory where I store my zotero database.
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