Keep in mind that the main usage of LiChess Tools and the browser I use are Chromium based, so all the developing, testing and so on will be done there. Therefore the updates for Firefox will be slower and probably there will be bugs that will be Firefox specific. But it works!
Get it for Firefox from here: https://addons.mozilla.org/en-US/firefox/addon/lichess-tools-by-siderite/
Let me know if everything is OK with it. Enjoy!
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