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In Firefox, once a window containing the Zotero pane is closed, the init function no longer works. "Extract Text..." still appears in the context menu for collections, but no longer functions.
This may due to the code that replaces the "no-tags-box" XUL with a word cloud failing on subsequent reopens.
Just run the full instantiation of the Zotero.PaperMachines object each time Zotero is opened. Not an ideal fix by any means, but it works for now.