adding of url to the firefox

README.md

@@ -36,7 +36,7 @@ is running somewhere else on mains electricity.
 ## Installation
 
 Download a binary from the [releases](https://github.com/browsh-org/browsh/releases) (~7MB).
-You will need to have Firefox 57 (or higher) aleady installed.
+You will need to have [Firefox 57](https://www.mozilla.org/en-US/firefox/new/) (or higher) aleady installed.
 
 Or download and run the Docker image (~230MB) with:
     `docker run --rm -it browsh/browsh`