An `user.js` is a configuration file that can control hundreds of Thunderbird settings.
For a more technical breakdown and explanation, you can read more on the [overview](https://github.com/HorlogeSkynet/thunderbird-user.js/wiki/1.1-Overview) Wiki page.
It differs from the `arkenfox user.js` in that the focus is to keep Thunderbird as an **email client** and disable as many web browsing features as possible. We believe web browsing should be done in a web browser, and not an email client.
- If you're using Thunderbird (<68)withTorwesuggestthatyouinstallthe [TorBirdy](https://addons.thunderbird.net/addon/torbirdy) add-on.IfyouareusingTor,youshouldalsoconsiderusing [Tails](https://tails.boum.org/) or [Whonix](https://www.whonix.org/).
- If you're using **Gmail**, please check [this article about OAuth2](https://github.com/HorlogeSkynet/thunderbird-user.js/wiki/3.1-OAuth2-Users).
- For information about [extensions](https://github.com/HorlogeSkynet/thunderbird-user.js/wiki/4.1-Extensions), see the Wiki.
- **Calendar** users should [see this page](https://github.com/HorlogeSkynet/thunderbird-user.js/wiki/4.1.1-Calendar).
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Also be aware that this `user.js` is made specifically for Thunderbird and has only been tested in the latest stable release.