Extension for increasing security and privacy level of the user.
1 - the minimal level of protection. Only changes that should not break most pages are enabled. Note that timestamps are rounded so pages relying on precise time may be broken.
2 - intended to be used as a default level of protection, this level should not break any site while maintaining strong protection.
3 - maximal level of protection: enable all functionality
The user can add own levels suited for web pages they visit.