When I try to install various add-ons, I get "This add-on requires Firefox xx. You are currently using Firefox 3.0.15.", even thou I upgraded to 3.6.13.. Same with FF4.0b7, the add-ons page still sees I have 3.0.15 [SOLVED]
Same goes with the recenlty installed 4.0b7, the add-ons page still sees I have 3.0.15. Even now, when I'm typing, the 'educated guess' about my version is still 3.0.15. In troubleshooting info, you will see version 4.07b...
Moambuepyre cor-el rupive
Opaite Mbohovái (2)
After I submitted the question, I found the instructions for reseting my user agent here https://support.mozilla.com/en-US/kb/Websites%20or%20add-ons%20incorrectly%20report%20incompatible%20browser. This solved the problem. Thank anyway! :)
For the record, you have a general.useragent.override setting showing in your More system details list.
general.useragent.override: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.15) Gecko/2009101601 Firefox/3.0.15
Using that pref to change the user agent (and forgetting about it) can cause such issues. You may have had an extension installed to spoof the user agent.