Why I see "upgrade your browser" messages on Web sites when I have the latest Firefox?

Installed on the computer of my mother who has the latest version of FireFox (I did that) it shows constantly posts on various sites like GMail the browser is obsolete and must be upgraded. As you can probably guess these messages mean almost nothing at all, except to the warn you that the site may not work, but they get boring every day when you cannot move to a version of FireFox that will come out in the literal future. What intrigues me is that I'm on a computer right now that uses FireFox 4.2 and I do not see these messages anywhere, but I saw them on his computer. I could just install Aurora, but which can confuse his...

Could check you the Firefox user agent string? This article explains how reset it is not blocked in the past: sites say that Firefox is obsolete or incompatible, even if it's the latest version.

Firefox 17.0.1 also reverses a change in Firefox 17.0 confused some Web sites (it returns the version of Gecko Gecko/20100101 Gecko/17.0), but I don't think that change created widespread problems.

Edit: Useragent string is listed in help > troubleshooting in the first table information.

Tags: Firefox

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