What add extension means?

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Tags

1. #cookie
2. #typically
3. #browser
4. #separate
5. #software
6. #variety
7. #extension
8. #management
9. #customizing
10. #including
11. #extensions
12. #small
13. #modifications
14. #blocking
15. #allow
16. #module
17. #browsers
18. #interface