This was a pretty interesting lab. I really enjoyed being able to see my own changes to the Firefox code affecting the actual browser.
It required me to dig a little deeper into the code than I am used to, fortunately MXR is always there to help me out with that.
Using the recommended changes from the wiki, I found that there were still some bugs. There was a bug when trying to delete a tab when there was less than 3, and also when I tried to create a new tab when there was only one open it would create 2 instead of 1.