Same or different directories?
Are the Zotero standalone app for Mac OS X and the Firefox plugin supposed to share the same directory or keep separate ones? What is recommended?
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When it's properly configured, you won't be able to open the Zotero pane in both simultaneously, and Zotero for Firefox will automatically switch into a lightweight connector mode (similar to the other browser plugins) when Standalone is opened and switch into full mode when Standalone is closed.