Developer installation tab doesn't open once


(Mojtabadaneshi) #1

Hi Dears,
I received two reviews and it’s seems FF has a bug in some computers to save its preferences.
After installing addon, developer could open a tab once, but in some computers it will appear again and again.

Is it a bug in FF?
Some users mailed me about it and one of them fixed it by removing FF and all prefs and reinstalling it.
Any suggestions?
Is solution here?

http://kb.mozillazine.org/Preferences_not_saved

Sincerely