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
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