What is a good free ad blocker?

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Tags

1. #opera
2. #available
3. #allow
4. #blockers
5. #preset
6. #block
7. #option
8. #social
9. #among
10. #users
11. #malware
12. #versions
13. #filter
14. #chrome
15. #safari
16. #media
17. #quickly
18. #adblock
19. #features
20. #firefox
21. #popular
22. #buttons
23. #quick
24. #setup
25. #loading
26. #lists