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

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

Check and tell if its working.

thank you for replying! but i already got stuck on the second step. I don't see, "Restart with Add-ons Disabled"

-> Close Firefox (ALT + F -> Exit)

Start Firefox in Safe Mode by Holding SHIFT key while Starting Firefox

                               OR

As an alternative method, press Win key + R key and enter one of the following in the Windows Run box:

      firefox -safe-mode
                    OR
      "C:\Program Files\Mozilla Firefox\firefox.exe" -safe-mode 

-> Firefox Safe Mode window will appear -> DON'T SELECT ANY OPTIONS, just click Continue in Safe Mode

Firefox will now open up with just basic Firefox. Now do this:

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

-> Update Firefox to the latest version by going to Help Menu -> About Firefox -> click Check for Updates -> if an updated version is found then download the latest version and install it. After that follow these steps:

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

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

-> go to Tools Menu -> Clear Recent History -> Time range to clear: select EVERYTHING -> click Details (small arrow) button -> place Checkmarks on Cookies, Cache -> click Clear Now

-> 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 -> 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

-> go to Tools Menu -> Options -> Advanced -> Network -> Offline Storage (Cache): click Clear Now button

-> Click OK on Options window

-> click the Favicon on SearchBar -> 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

-> go to Tools Menu -> Add-ons -> Appearance section -> REMOVE All Incompatible/Unwanted/Suspicious Themes (Persona) -> Restart Firefox

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

atizon:

"Restart with Add-ons Disabled" - that menu item first appeared in Firefox 4; you are using Firefox 3.6.18

Try Tools > Options > Add-ons > Plugins. Look for "Java(TM) Platform SE 6 U26 6.0.260.3" or similar.

• If it is there and grayed-out, click on the Enable button.
• If it is not the same version (6.0.260.3), you need to update Java.

If you do not see Java(TM) Platform SE 6 U26 6.0.260.3" or similar, you need to install Java or update it. See: Installing or Updating Java

If the message says JavaScript instead of Java (the two are not the same), then look in Tools > Options > Add-ons for an extension that might be blocking JavaScript.

• See: http://kb.mozillazine.org/JavaScript_is_not_Java

You also need to update Adobe Flash (Shockwave Flash).

• See: https://support.mozilla.com/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash
• Also see: https://support.mozilla.com/en-US/kb/Managing%20the%20Flash%20plugin#w_testing-flash

Java doesn't show in your More system details list, so you need to install Java.

See:

• http://kb.mozillazine.org/Java
• http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)