Firefox is the most recent version, but websites see it as firefox 3.6
Windows Vista, Firefox 45.0.2
Websites say the browser is out of date, and it reads as the firefox version is 3.6
الحل المُختار
Your useragent was modified and been stuck since when you were using 3.6.16 (3.6.28 was last) as Firefox 4.0 and newer Firefox usersagents could not be modified this way since.
User Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.16) Gecko/20110319 Firefox/3.6.16 ( .NET CLR 3.5.30729; .NET4.0C) FBSMTWB https://support.mozilla.org/en-US/kb/websites-say-firefox-outdated-or-incompatible
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الحل المُختار
Your useragent was modified and been stuck since when you were using 3.6.16 (3.6.28 was last) as Firefox 4.0 and newer Firefox usersagents could not be modified this way since.
User Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.16) Gecko/20110319 Firefox/3.6.16 ( .NET CLR 3.5.30729; .NET4.0C) FBSMTWB https://support.mozilla.org/en-US/kb/websites-say-firefox-outdated-or-incompatible
Modified