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affa OP wrote (edited )

Its an extension that let you block certain traffic per domain. You can block cookies, script, etc from 1st party, any 3rd party, specific domains and so on.

Kind of like a firewall in the browser.

https://addons.mozilla.org/en-US/firefox/addon/umatrix/

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NAB wrote

so why not use something like privacy badger instead?

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