Support Custom Third Party Blocklists & scriptlets

[TakeOne]

It is nice that Firefox tries to protect users from Tracking.

Depending on the country you are in and the websites you visit, the provided default list (disconnect) is missing things.

It would be nice if Firefox would allow the user to supply his own filterlist subscriptions and replacement script like Ublock Origin does.

The community is quite fast to fix broken pages and add new sources for tracking scripts.

[Jon]

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