Reset the page zoom on pages that cause problems: <b>View > Zoom > Reset</b> (Ctrl+0 (zero); Cmd+0 on Mac) *http://kb.mozillazine.org/Zoom_text_of_web_pages

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