I tried to add on a Zotero integration app. It didn't work. Now each time I open Firefox it tries again to integrate the app and I get an error message.

Here is the error message when I open up Firefox and it tries again to install the Zotero integration app: (I only have Word 2011)
Installation could not be completed because an error occurred.
[Exception... "'Neither Word 2004 nor Word 2008 appear to be installed on this computer. Please install Microsoft Word, then try again. @[install:install.m:140]' when calling method: [nsIRunnable::run]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "JS frame :: resource://zotero-macword-integration/installer.jsm :: <TOP_LEVEL> :: line 67" data: no]

Hello,
If Zotero was installed as a Firefox Add-on then please disable or remove it. That should stop the error message. See more info on how to remove add-ons here:
[[Disable or remove Add-ons]]
If this doesn't work then you should try starting Firefox in safe mode. See whether the error message appears when in Safe Mode and let me know. See here for more info on how to get into Safe Mode:
[[Troubleshoot Firefox issues using Safe Mode]]

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