After the 8.0.1 upgrade Firefox will download but not install extensions after upgrade to 8.0.1

Windows Vista. Avast Antivirus with Sandbox feature.
Outdoor sandbox - all available extensions. In sandbox - not available extensions and not able to install all extensions. IE Adblock Plus, no. Script etc.
Before you spend to 8.0.1 no problem in both modes. Add-ons - seem to be intact in both modes.
When you try to install an extension after downloading:
"the (extension) could not be installed because Firefox is unable to modify the required".
Reluctant to delete the dat pluginreg all extensions that work out of Sandbox.

Sorry for the confusion. Please see this and this. Looks like there issues on and off with the sandbox and Avast is up-to-date and working.

Tags: Firefox

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