Why is Firefox not recognized as a modern brower?

Whenever I log on to most sites (gmail, youtube, google news, etc) I get a message telling me that my browser is not supported and I need to upgrade to a modern browser. I am running Windows 7 and the browser is Firefox 8. I have reintalled FF8 after deleting it entirely and initially it worked, however, upon restart it began to do the same thing, gmail coming up in HTML for instance, and sites requiring the same upgrade that I just did. I saw there was an issue with Adblock, so I deleted that from my ad-ons, tried to find an issue with about:config but could see no glaring issue. I also saw on the web that someone running IE8 had a similar problem and they were told to alter some IE specific fields in Regedit. I didn't do these, not being sure they would be the same for FF8. Other browsers I use, Chrome, Safari, do not have this problem and in fact I have virtually gone over to Chrome since this has been an issue from the day I installed FF8. What is wrong with the program, and why does it switch back to incompatible after a restart?

You seem to have the general.useragent.override pref set to an empty string.<br />
You can reset that pref to the default via the right-click context menu to remove that override.

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Why is Firefox not recognized as a modern brower?

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