My firefox version is 3.6.12, however I cannot download any add-ons cause it says I am still using version 2, and it is the same for website such as youtube where it is always saying I am using a outdated browser. How do I solve this?

I keep updating my firefox whenever it prompts me to, and now I am using version 3.6.12, but I still cannot download any add-ons or have problem using youtube cause they still says I am using a older version of the browser.
But when I go Help > About Mozilla Firefox, I am sure I have the latest version and no more updates can be found.

You have or had an extension installed (MegaUpload toolbar) that has changed the user agent from Firefox/3.6.12 to Firefox/2.0.0.13
You can check the general.useragent prefs on the about:config page:
* general.useragent.extra.firefox Firefox/2.0.0.13 MEGAUPLOAD 1.0
You can open the about:config page via the location bar, just like you open a website.<br />
Filter: general.useragent<br />
If general.useragent prefs are bold (user set) then you can right-click that pref and choose Reset.
See [[Web sites or add-ons incorrectly report incompatible browser]] and [[Finding your Firefox version]]<br />
See also http://kb.mozillazine.org/Resetting_your_useragent_string_to_its_compiled-in_default
Your above posted system details show multiple Java Console extensions.<br />
You can uninstall (remove) the Java Console extensions and disable the Java Quick Starter extension, you do not need them to run Java applets.
See http://kb.mozillazine.org/Java#Multiple_Java_Console_extensions
See also http://www.java.com/en/download/help/quickstarter.xml - What is Java Quick Starter (JQS)? What is the benefit of running JQS? - 6.0
Disable the Java Quick Starter extension: Tools -> Addons -> Extensions
Control Panel -> Java -> Advanced tab -> Miscellaneous -> Java Quick Starter (disable)
You should update the [[Java]] plugin (Java Plug-in 1.6.0_12) to the latest version (6 U22).
*http://java.sun.com/javase/downloads/index.jsp (Java Platform: Download JRE)

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