I use only Mozilla Firefox browser. I noticed that every time I search on Google, Yahoo or Bing, click on a link my browser redirects me to spam web-sites.
Any help is appreciated. Thanks!
Browser redirects to unwanted ads and spam sites are a sign of possible infection of your computer or browser with malware or adware. In order to stop browser redirect in Firefox I recommend you check the list of installed extensions, then reset Firefox browser settings. You need to remove all unknown and suspicious extensions.
Most often these two actions are enough to stop browser redirect in Mozilla Firefox. In case this does not help, try to check your computer with one of the programs listed here http://www.myantispyware.com/2018/04/23/best-free-malware-removal-tools/