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Old version warning with lastest version

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Some sites, like Gmail and Google +, display a warning of "old version" of firefox, but I already have the latest version (6.0.2).

I have firefox on this computer since version 3.0, updating it whenever a version is released. This may be the cause of the problem? How the browser tells his version to the web pages?

Sorry for my English.

Some sites, like Gmail and Google +, display a warning of "old version" of firefox, but I already have the latest version (6.0.2). I have firefox on this computer since version 3.0, updating it whenever a version is released. This may be the cause of the problem? How the browser tells his version to the web pages? Sorry for my English.

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Reset your user agent. Had the same problem, solved it. Here's the how to : https://support.mozilla.com/en-US/kb/Websites+or+add-ons+incorrectly+report+incompatible+browser

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Your user agent shows that you have or had the Fast Browser Search toolbar (FBSMTWB) installed.

Control Panel > Add or Remove Programs
Uninstall "Fast Browser search protection" and "Fast Browser Search"

See also these pages and threads about Fast Browser Search.