pdf's open outside Firefox

For some reason, pdf files stored with library items in zotero (1.0) are suddenly now opening in their own window in Adobe Reader. I have checked the launchNonNativeFiles setting, and it is still set to false. I actually like this behaviour (because it is easier to view the pdf file without opening and closing Zotero to use more of the screen for the pdf file) but I am concerned that there is some instability that may be affecting Zotero. Web sites that have always opened pdf's within Firefox using the plugin still do so.
1: Should I be concerned?
2: If I want to return to the default behavior (pdf's open within Firefox instead of a new window), what should I do?
  • http://forums.zotero.org/discussion/7293/trouble-using-firefox-plugin-to-view-pdfs-in-browser-window/#Item_5
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