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Make view web quick and simple, block useless web content to let web fast, set browser UserAgent as needed, block cross sites Referer http request to protect privacy.

Block useless web content to let web fast(like any adblock addons).
set browser UserAgent as needed(let user view web in desktop or mobile mode with some exceptions).
block cross sites Referer from http request to protect privacy.

Goto Add-ons Options ui, check what feature you needed.