Add listing pages to README

Author: bhollis

README.md

@@ -3,6 +3,9 @@ JSONView
 
 [JSONView](http://jsonview.com) is a Web extension compatible with Firefox and Google Chrome that helps you view JSON documents in the browser.
 
+* [Install for Firefox](https://addons.mozilla.org/en-US/firefox/addon/jsonview/)
+* [Install for Chrome](https://chrome.google.com/webstore/detail/jsonview/gmegofmjomhknnokphhckolhcffdaihd)
+
 Normally when encountering a [JSON](http://json.org) document (content type `application/json`), Firefox simply prompts you to download the view. With the JSONView extension, JSON documents are shown in the browser similar to how XML documents are shown. The document is formatted, highlighted, and arrays and objects can be collapsed. Even if the JSON document contains errors, JSONView will still show the raw text.
 
 Once you've got JSONView installed, check out [this example JSON file](http://jsonview.com/example.json) to see the extension in action!