Why am I seeing "upgrade your browser" messages on websites when I have the newest FireFox?

On my mother's computer which has the latest version of FireFox installed (I've made sure of that) it constantly shows messages on varying sites such as GMail that the browser is out of date and should be upgraded. As you can probably guess these messages mean almost nothing at all except to warn you that the site may not work, but they get annoying day after day when you can't upgrade to some version of FireFox that will be released in the literal future. What puzzles me is that I'm on a computer right now that is using FireFox 4.2 and I don't see these messages anywhere but I have seen them on her computer. I might just install Aurora but that might confuse her....

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