Update README.md

Author: ttop32

README.md

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 Mouseover Translate Any Language At Once - Chrome Extension  
 
-Download from [chrome web store](https://chromewebstore.google.com/detail/hmigninkgibhdckiaphhmbgcghochdjc) and [Edge Extension store](https://microsoftedge.microsoft.com/addons/detail/mouse-tooltip-translator/nnodgmifnfgkolmakhcfkkbbjjcobhbl)
+Download from [chrome web store](https://chromewebstore.google.com/detail/hmigninkgibhdckiaphhmbgcghochdjc), [Edge Extension store](https://microsoftedge.microsoft.com/addons/detail/mouse-tooltip-translator/nnodgmifnfgkolmakhcfkkbbjjcobhbl) and [Firefox Addons](https://addons.mozilla.org/en-US/firefox/addon/mouse-tooltip-translator/)
+
+
 
 [<img alt="chrome web store" height="64px" src="doc/google.png" />](https://chrome.google.com/webstore/detail/mouse-tooltip-translator/hmigninkgibhdckiaphhmbgcghochdjc)
 [<img alt="microsoft store" height="64px" src="doc/microsoft.png" />](https://microsoftedge.microsoft.com/addons/detail/mouse-tooltip-translator/nnodgmifnfgkolmakhcfkkbbjjcobhbl)
 [<img alt="softpedia" height="64px" src="doc/softpedia.png" />](https://www.softpedia.com/get/Internet/Internet-Applications-Addons/Chrome-Extensions/Mouse-Tooltip-Translator-for-Chrome.shtml)
+- firefox maintained by SGpirr
 
 # Result