Firefox extensions Adblockplus, Noscript, Ghostery
Chrome Adblockplus, Ghostery
apps like privoxy
block 3rd party cookies
Browse using Incognito mode
lots of different ways to do the same thing without using something that slows down your computer.
For a lot more ways/ideas see my blog page:
Security and Privacy on the Internet - LinuxQuestions.org - https://www.linuxquestions.org/quest...internet-3080/