Adblock Plus, the most popular ad blocker on Firefox, Chrome, Safari, Android and iOS. Block pop-ups and annoying ads on websites like Facebook and YouTube.
I set up my browser to delete cookies and history when I close it. I get nearly zero junk emails and typically see only random ads for products I usually do not care about.
Passwords and website personal settings are generally stored in cookies. Special allowances have to be set up to keep using them.
