User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a5pre) Gecko/20070601 SeaMonkey/2.0a1pre Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a5pre) Gecko/20070601 SeaMonkey/2.0a1pre Currently (Build 2007060102), clicking links in the Add-on Manager window launches external application/browser if SeaMonkey is not set as default browser. Reproducible: Always Steps to Reproduce: 1. Open Add-on Manager 2a. Click Get Extensions/Get Themes link (at the bottom right of the window) or 2b. Look at DOM Inspector's About page and then click Visit Home Page link Actual Results: SeaMonkey requests permission to launch external application (in my case: Firefox because it is my default browser) Expected Results: Links should be handled internally, except if Navigator component is not installed.