-> Tap ALT key or press F10 to show the Menu Bar

-> go to Help Menu -> select "Restart with Add-ons Disabled"

Firefox will close then it will open up with just basic Firefox. Now do this:

-> Update ALL your Firefox Plug-ins https://www.mozilla.com/en-US/plugincheck/

-> go to View Menu -> Toolbars -> unselect All Unwanted toolbars

-> go to Tools Menu -> Options -> Content -> place Checkmarks on:

1) Block Pop-up windows 2) Load images automatically 3) Enable JavaScript

-> go to Tools Menu -> Options -> Privacy -> History section -> Firefox will: select "Remember History"

-> go to Tools Menu -> Options -> Security -> place Checkmarks on:

1) Warn me when sites try to install add-ons 2) Block reported attack sites 3) Block reported web forgeries 4) Remember Passwords for sites

-> Click OK on Options window

-> click the Favicon (small drop down menu icon) on Firefox SearchBar (its position is on the Right side of the Address Bar) -> click "Manage Search Engines" -> select all Unwanted Search Engines and click Remove -> click OK

-> go to Tools Menu -> Add-ons -> Extensions section -> REMOVE All Unwanted/Suspicious Extensions (Add-ons) -> Restart Firefox

You can enable your Known & Trustworthy Add-ons later. Check and tell if its working.

sunderrao:

If you're using Firefox 5.0, an update to Firefox 5.0.1 (released to regular channel users 12-Jul-2011) might fix the problem. According to the changelog for v. 5.0.1 posted on the FileHippo site here, this update fixes a problem with the Java plugin for Mac OS X users, and it's possible the update may fix the Java plugin problem for XP3 users as well.

Firefox 5.0 users who try a manual update (Help | About Firefox | Check For Updates) are currently being told that their Firefox is up to date, but you can download v. 5.0.1 from FileHippo or from the mozilla website here.

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Windows Vista Home Premium 32-bit, Firefox 5.0, HP Pavilion dv6835ca