GitHub - arkenfox/user.js: Firefox privacy, security and anti-tracking: a comprehensive user.js template for configuration and hardening
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Firefox privacy, security and anti-tracking: a comprehensive user.js template for configuration and hardening - arkenfox/user.js

I prefer Librewolf as it is easier and simpler to use

Have you independently confirmed this?

What is preventing user.js from doing exactly what you’re describing right now on your system?

Sure. For simplified example have only the following in your user.js file:

user_pref("browser.tabs.warnOnClose",true);
  1. Start Firefox
  2. Observe that the pref is indeed true
  3. Go to Setting > General, observe that Confirm before closing multiple tabs is checked
  4. Uncheck the option
  5. In about:config observe that browser.tabs.warnOnClose is now false
  6. Restart Firefox
  7. Observe that the pref is again set to true

The reason is also very simple. Firefox will never write anything to user.js - thus any changes you do at runtime will only be stored to prefs.js. However, user.js always overrides prefs.js at startup.

Understood, thanks. So on a clean install, I’m assuming user.js is either empty or missing, correct?

Yes. Firefox doesn’t create user.js file itself - if you want one then you need to create it yourself either manually or with some tool. Also, I’ve seen some “security” software create user.js file without notifying the user about it…

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