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How can I stop Firefox 4 from displaying "The document cannot change while Printing or in Print Preview" from appearing every time I click on File/Page Preview?

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Clicking on File/Page Preview in Firefox 4 brings up a warning dialog "The document cannot change while Printing or in Print Preview" every time. How can I stop this from happening? It is very annoying, and it is necessary to click "OK" on this dialog twice before it will go away. Thank you.

Clicking on File/Page Preview in Firefox 4 brings up a warning dialog "The document cannot change while Printing or in Print Preview" every time. How can I stop this from happening? It is very annoying, and it is necessary to click "OK" on this dialog twice before it will go away. Thank you.

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Does it behave that way in Use Troubleshoot Mode in Firefox ?

If it doesn't, then one of your add-ons in the culprit.