刚去官网扫了眼，已经118了，不再支持win8.1及其以下
Firefox is no longer supported on Windows 8.1 and below.
Please download Firefox ESR (Extended Support Release) to use Firefox.
Windows
Operating Systems (32-bit and 64-bit)
Windows 10 or later
Recommended Hardware
1 gigahertz (GHz) or faster compatible processor or System on a Chip (SoC)
1GB of RAM / 2GB of RAM for the 64-bit version
500MB of hard drive space
【 在 Siegelion 的大作中提到: 】
: 目前还可以吧，可能115以后不支持Win7了，目前还是当前版本
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