I'm using FF 4 but i wont install add ons saying I'm running FF3.

toshiba satellite l, vista/AMD xd dual core/32 bit

Your user agent string (identifies the version of Firefox) is shown as "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729) FBSMTWB" which indicates that Firefox 3.5.5 is installed.
Try resetting the user agent string so that it correctly identifies your version of Firefox:
# Type '''about:config''' into the location bar and press enter
# Accept the warning message that appears, you will be taken to a list of preferences
# In the filter box at the top type '''general.useragent''', this should bring up a small number of preferences
# Right-click on each one and choose '''Reset'''
It should hopefully then correctly identify the version of Firefox being used. The preference that is likely to have caused your problem is general.useragent.override
For more details see https://support.mozilla.com/kb/Websites+or+add-ons+incorrectly+report+incompatible+browser

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