Download CSS tweaks for Firefox 57+ What is possible in Firefox 57+? How to keep many CTR features after moving to Firefox 57+? This add-on will stop working when Firefox 57 arrives in November 2017 and Mozilla drops support for XUL / XPCOM / legacy add-ons. It will work in Firefox 52 ESR until ESR moves to Firefox 60 in 2018 (~Q3). Waterfox and Basilisk browsers are based on Firefox and will keep
![Classic Theme Restorer (Fx29-56) – Firefox 向けアドオン](https://cdn-ak-scissors.b.st-hatena.com/image/square/431ae49b40965779dac4bb5ca956c0c449c12f67/height=288;version=1;width=512/https%3A%2F%2Faddons.cdn.mozilla.net%2Fimg%2Fuploads%2Faddon_icons%2F472%2F472577-64.png%3Fmodified%3D1397055479)