User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b9pre) Gecko/20110109 Firefox/4.0b9pre Build Identifier: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b9pre) Gecko/20110109 Firefox/4.0b9pre when in normal mode, the Panorama icon is next to the list all tabs icon. When you click on it, the icon moves over to where the list all tabs icon was. This behaves differently than every other button in virtually every OS. You shouldn't have to find a button again after clicking it! Also, if you try to click it multiple times, the first time, you'll activate Panorama. After moving your mouse, you'll deactivate it. But then clicking in the same spot activates list all tabs. This is not what users expect. Reproducible: Always Steps to Reproduce: 1. Click Panorama icon 2. Panorama activates. Oops. Icon has decided to move to a different location! User is confused and has to do extra work to deactivate Panorama. 3. Find the icon again. Click it. 4. Panorama deactivates. Oops. Mouse is now over List all tabs icon! Now if you click again without moving the mouse back, something else is activated! Actual Results: User does a lot of unnecessary work and is confused by the button that moves around for no good reason. Expected Results: Buttons stay under your mouse when clicked, just like in every other interface. Additionally, it might make sense to change the icon appearance slightly to indicate that clicking the icon has caused the browser to change state, and clicking it again will cause it to exit Panorama.