After installing Firefox 10.0, Firefox checks the compatibility of extensions everytime I start the program. I went back to 9.01.
Usually Firefox checks the compatibility of add-ons and extensions once after installation. In 10.0 this happens everytime the program is started. In 9.01 this does not happen. I use Winsows 7, 64 bit-version. When I installed the program on another computer with 32-bit version there was no problem.
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See:
- http://kb.mozillazine.org/Preferences_not_saved
- https://support.mozilla.org/kb/Preferences+are+not+saved
Which security software (firewall, anti-virus) do you have?
Some have a virtualization feature that causes files in the Firefox Profile Folder to get reset to previous content.