User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.9.2b4) Gecko/20091124 Firefox/3.6b4 Build Identifier: It redirects Reproducible: Sometimes
That's a symptom of some kinds of malware/adware. Often the adware variety piggy-back along with some other software you (or a teen-ager in the house?) install on your machine. The support folks at http://support.mozilla.com can point you in the right direction to get help cleaning up your system. There are several reputable anti-malware sites that specialize in that kind of help.
resolving per comment 1.
Status: UNCONFIRMED → RESOLVED
Last Resolved: 8 years ago
Resolution: --- → INVALID
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