Prevent data leaks in your Firefox

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Prevent data leaks in your Firefox

Post by flux » Tue Sep 18, 2018 4:08 pm

Although Firefox is considered safe and reliable browser, it has separate modules that track users behavior and send statistics to remote servers. Bad news is that year by year there are more modules like that appearing and they are activated by default. Good news is they can be turned off in about:config.

This repo maintains an up-to-date list of options that should be disabled in about:config to prevent data leakage:

Google "Safe" Browsing

Sends every URL you visit to Google, this means if you hacked a site and use an unprotected web-shell to manage it, Google will know the web-shell's URL and what IP you visited it from.


Firefox Statistics

Sends data reports to Firefox about your browser performance and stability



Leaks a real IP of your internet connection even when you use Tor/VPN


Encrypted Media Extensions (DRM)

A binary plugin with unknown source code that comes with Firefox since version 38. Allows you to play encrypted media content and use Netflix and others without Microsoft Silverlight. It uses Intel chipset and CPU hardware instructions to invoke communications, thus can affect your hardware maliciously without your consent.
To completely uninstall the plugin, you need to use the version of the EME-free Firefox browser: or use Firefox ESR builds provided by Debian/Ubuntu and other Linux distributions.


Firefox Hello

Firefox connects to third-party services ("Telefonica") without user consent



A third-party service for manipulating "read later" articles/publications.




Search suggestions

Everything you write in a browser search or URL box is instantly sent to remote servers

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Post by sigint » Tue Sep 18, 2018 6:38 pm

Nice info for general learning, Google Safebrowsing is indeed a pain in the ass, this is how NSA usually discover your stuff when you think you are a secure guy.

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Post by pepsisoda » Sat Dec 15, 2018 3:46 pm

Thanks for this. Most of this is turned off in TOR; although telemetry is turned on in some instances I notice in about:config. Don't forget about canvas blocker and 1st party isolate for your regular browser.

FF is still although they sold out in many ways but their original focus on user control is still there.

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Post by dradnanco » Fri Oct 30, 2020 2:00 pm

i bought usa used laptop instead of mine
and change mac address and connect to vpn
and use private browser
iam so happy in this forum !!

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