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A complete walk-through of this lab has been done, and is posted [[Dive into Mozilla Modifying Firefox Lab|here]]. '''DO NOT''' read this before trying to make the change on your own. If you get stuck, you are encouraged to consult with your classmates, use IRC, etc. Only use this information as a last resort, and read as little as possible. You'll gain most if you do it on your own and stretch yourself.
= Answer =
if(!(this.mCurrentTab._tPos == this.browsers.length - 1))
this.moveTabTo(t,this.mCurrentTab._tPos + 1);