Update readme.md

readme.md

@@ -5,11 +5,4 @@ Derived from the work of Steven Frank's [cloud-to-butt](https://github.com/panic
 
 ## Installing
 
-Download [CloudToButt.xpi](https://github.com/DaveRandom/cloud-to-butt-mozilla/blob/master/CloudToButt.xpi?raw=true)
-
-
-## Building
-
-1. Download the code, open FireFox.
-2. Click *Add-ons* from the *Tools* menu and select the *Extensions* tab.
-3. Drag-and-drop the XPI file onto the page.
+[Download it from Firefox Add-ons](https://addons.mozilla.org/en/firefox/addon/cloud-to-butt/)