-> 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 -> '''Zoom''' -> click '''Reset''' -> '''Page Style''' -> select '''Basic Page Style''' -> go to View Menu -> Toolbars -> unselect All Unwanted/Incompatible Toolbars -> go to Tools Menu -> Clear Recent History -> '''Time range to clear: select "EVERYTHING"''' -> click Details (small arrow) button -> place Checkmarks on '''Cookies, Cache, Active Logins, Site Preferences''' -> click '''Clear Now''' -> go to Tools Menu -> Options -> General -> in '''Startup''' section click '''Reset to Default''' -> 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 -> go to Tools Menu -> Options -> Advanced -> Network -> Offline Storage (Cache): click '''Clear Now''' button -> Click OK on Options window -> go to Tools Menu -> Add-ons -> Extensions section -> REMOVE All Unwanted/Suspicious/Incompatible Extensions (Add-ons) -> go to Tools Menu -> Add-ons -> Appearance section -> REMOVE All Unwanted/Suspicious/Incompatible Themes (Persona) -> Restart Firefox You can enable your Known & Trustworthy Add-ons and Themes later. Check and tell if its working.