Tuesday, March 22, 2011

Firefox 4 - "Undo Close Tab" grayed out

After upgrading to Firefox 4, the Undo Close Tab feature stopped working.

My solution was to close Firefox, then enter the profile directory and remove the "sessionstore.js" file (not sessionstore-1.js, etc. - just remove the one without a hyphen and a number). This immediately fixed the problem.

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