Firefox is no longer supported on Windows 8.1 and below. Please download Firefox ESR (Extended Support Release) to use Firefox.
![Download and test future releases of Firefox for desktop, Android and iOS.](https://cdn-ak-scissors.b.st-hatena.com/image/square/975ae6336f1c9baf5ff3b6578a2ab48044c9ef67/height=288;version=1;width=512/https%3A%2F%2Fwww.mozilla.org%2Fmedia%2Fprotocol%2Fimg%2Flogos%2Ffirefox%2Fbrowser%2Fog.4ad05d4125a5.png)
Firefox is no longer supported on Windows 8.1 and below. Please download Firefox ESR (Extended Support Release) to use Firefox.
Firefox is no longer supported on Windows 8.1 and below. Please download Firefox ESR (Extended Support Release) to use Firefox.
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