Split Browser Extension breaks Zotero

I have the Split Browser extension (version 0.6.2009110501) which splits your browser into side by side pains. When it is enabled, attempting to start Zotero by any method fails. I tried clicking on the status bar, the menu item under the Tools menu and keying Shift-Command-Z. You can still access Zotero preferences, make changes, and see for example different icons in the status bar, but Zotero won't open. This was true in 2.0 RC4 and RC5.

There is a comment on Split Browser's page from a user who had the same problem. https://addons.mozilla.org/en-US/firefox/addon/4287 I didn't find any comments about the Split Browser extension blocking Zotero in the forums though.

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