hello Dorsa, it looks like you have malware on your computer. please perform all these steps: hello, you have various malicious addons present. please perform all these steps: # press the shift key while you're launching firefox - you'll then be shown a dialog window from where you can [[Reset Firefox – easily fix most problems|refresh firefox]] # afterwards go to the firefox menu ≡ > addons > extensions and in case there are still extensions listed there, disable them. # finally run a full scan of your system with different security tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] and [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner] to make sure that adware isn't present in other places of your system as well. [[Troubleshoot Firefox issues caused by malware]]