Update README.MD

Firefox/New/README.MD

@@ -1,12 +1,12 @@
 # Firefox 
 ## prefs.js
 
-# Windows
+# Windows [download](https://download.mozilla.org/?product=firefox-esr-latest&os=win&lang=zh-CN)
 ```
 %AppData%\Mozilla\Firefox\Profiles
 ```
 
-# MacOS
+# MacOS [download](https://download.mozilla.org/?product=firefox-esr-latest&os=osx&lang=zh-CN)
 ```
 ~/Library/Application Support/Firefox/Profiles
 ```