# Additional Resources

* [bugzilla.mozilla.org: Firefox for Librem 5, PinePhone & other Linux phones
  support tracker](https://bugzilla.mozilla.org/show_bug.cgi?id=1579348)
* [How to use the Firefox Browser Toolbox](https://developer.mozilla.org/en-US/docs/Tools/Browser_Toolbox)
* [firefox-csshacks](https://github.com/MrOtherGuy/firefox-csshacks/)
* [fx-css-variables.txt](https://gist.github.com/MrOtherGuy/a673848c95823225f7b198199f87a396)
* [FirefoxCSS subreddit](https://www.reddit.com/r/FirefoxCSS/)
* [whattrainisitnow.com](https://whattrainisitnow.com/): FF and FF ESR releases
  currently supported upstream, we try to support these with this config

