hello, those might be triggered by adware on your pc. please try these steps: # [[Reset Firefox – easily fix most problems|reset firefox]] (this will keep your bookmarks and passwords) # afterwards go to firefox > addons > extensions and in case there are still extensions listed there, disable them. # 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]. # [https://www.mozilla.org/en-US/plugincheck/ update your plugins] (some of them are out-dated & have security vulnerabilities that are actively exploited on the web). [[Troubleshoot Firefox issues caused by malware]]