README: add resource "How to use the Firefox Browser Toolbox" (MR 22)

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plata 2021-12-13 18:46:01 +00:00 committed by Oliver Smith
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@ -104,5 +104,6 @@ changes are applied.
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## Additional resources ## Additional resources
* [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/) * [firefox-csshacks](https://github.com/MrOtherGuy/firefox-csshacks/)
* [FirefoxCSS subreddit](https://www.reddit.com/r/FirefoxCSS/) * [FirefoxCSS subreddit](https://www.reddit.com/r/FirefoxCSS/)