-> 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 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 -> '''Zoom''' -> click '''Reset''' -> '''Page Style''' -> select '''Basic Page Style''' -> 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 -> 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.