https://addons.mozilla.org/en-US/firefox/addon/bluhell-firewall/
I use this alongside Adblock Latitude. Maybe I shouldn't.
This is not actually firewall software, but an ad-blocker/privacy extension.
Tested 2.5.2, on Pale Moon 25.7.3 (x64), on Windows 10 updated recently-automatically.
I had previously used this on Firefox.
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Last updated 2019-12-06 at 08:03:37