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firefox dev tools inspector window keeps going blank
every few times i switch to FF to debug, the inspector window is totally blank. if i click the inspector tool and highlight html, it will appear to be scrolling over in the inspector window to highlight the code, but the page is totally blank. close/reopen tools fixes, but a few times later its broken again. has been going on for months and months, at least since v32. Using FirefoxDeveloperEdition.
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Does this also happen if you use a release version instead of the beta?
Create a new profile as a test to check if your current profile is causing the problem.
See "Creating a profile":
If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.
A new profile didn't help.
I don't know for sure, but it may be triggered by alt-tabbing between Dev Edition and Release.