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Cannot open Remote XUL manager under Developer - version 29.0.1 - nothing happens!

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Cannot open Remote XUL manager under Developer - version 29.0.1 - nothing happens!

Cannot open Remote XUL manager under Developer - version 29.0.1 - nothing happens!

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I found that after Firefox v29, a LOT of my settings and
add-ons were changed / reset. Try this;
Start Firefox in Safe Mode
While you are in safe mode;
Firefox Options > Advanced > General.
Look for and turn off Use Hardware Acceleration.
Then check ALL of your settings. Browser and add-ons. Then restart.