Chrome or Safari Rated 5 out of 5 stars

I wrote some codes for Google Chrome and Safari on the launchy.xml .
When From Firefox 3, i call Chrome, Chrome opens two new tabs, one tab's addressbar displays 'http://browser/', but another one displays correct URL.
Trying Safari, it opens with one tab, and addressbar display Browser%20 + correct URL.
Why is it so when calling WebKit browsers?

This review is for a previous version of the add-on (4.2.0).