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Ever since the most recent Microsoft Window 7 upgrade (09/10/13) my firefox portable got rid of addons installed before the upgrade & can't get more to install.

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Ever since the latest 'upgrade' of Windows 7 my Firefox portable lost addons that were installed and will not install addons properly.

Ever since the latest 'upgrade' of Windows 7 my Firefox portable lost addons that were installed and will not install addons properly.

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Firefox Portable isn't an official Mozilla project, it is a 3rd party version which is authorized by Mozilla.
Firefox Portable support forum is over here:
http://portableapps.com/forums/support/firefox_portable