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I'm using the latest version but it won't let me install Adblock Plus because it thinks I'm using Firefox 2.0. Youtube also thinks I'm using an old version.

Posted

I've tried updating Firefox several times, and I just completely uninstalled it, then installed it again.

I've tried updating Firefox several times, and I just completely uninstalled it, then installed it again.

Chosen solution

You have a corrupted user agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/2.0.0.11 (.NET CLR 3.5.30729)

See Find what version of Firefox you are using and Web sites or add-ons incorrectly report incompatible browser

See also http://kb.mozillazine.org/Resetting_your_useragent_string_to_its_compiled-in_default

Check the general.useragent prefs on the about:config page.
You can open the about:config page via the location bar, just like you open a website.
Filter: general.useragent
If any general.useragent prefs are bold (user set) then right-click that pref and choose Reset.

Read this answer in context 2

Additional System Details

This happened

Every time Firefox opened

Installed Plug-ins

  • npunagi2
  • np-mswmp
  • kanevapatch
  • Adobe PDF Plug-In For Firefox and Netscape
  • 1.7.0069.2
  • npdnu
  • npdnupdater2
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Default Plug-in
  • Shockwave Flash 10.1 r53
  • Adobe Shockwave for Director Netscape plug-in, version 11.5
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • Next Generation Java Plug-in 1.6.0_20 for Mozilla browsers

Application

  • User Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/2.0.0.11 (.NET CLR 3.5.30729)

More Information

cor-el
  • Top 10 Contributor
  • Moderator
17768 solutions 160708 answers

Chosen Solution

You have a corrupted user agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/2.0.0.11 (.NET CLR 3.5.30729)

See Find what version of Firefox you are using and Web sites or add-ons incorrectly report incompatible browser

See also http://kb.mozillazine.org/Resetting_your_useragent_string_to_its_compiled-in_default

Check the general.useragent prefs on the about:config page.
You can open the about:config page via the location bar, just like you open a website.
Filter: general.useragent
If any general.useragent prefs are bold (user set) then right-click that pref and choose Reset.

You have a corrupted user agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/2.0.0.11 (.NET CLR 3.5.30729) See [[Finding your Firefox version]] and [[Web sites or add-ons incorrectly report incompatible browser]] See also http://kb.mozillazine.org/Resetting_your_useragent_string_to_its_compiled-in_default Check the <b>general.useragent</b> prefs on the <b>about:config</b> page.<br /> You can open the <i>about:config</i> page via the location bar, just like you open a website.<br /> Filter: <b>general.useragent</b><br /> If any <i>general.useragent</i> prefs are bold (user set) then right-click that pref and choose <i>Reset</i>.<br />
DaveRo 18 solutions 175 answers

Deleted

Deleted

Modified by DaveRo

Question owner

The second link solved my problem, thanks!

The second link solved my problem, thanks!