Clicking on Panorama button in Firefox 4 will zoom out and shows overview of all tabs in Panorama, similarly clicking on any tab in a tab group will zoom in to that tab.  These animations will make access to Panorama much slower, by disabling these animations we can quickly access panorama.

disable zoom in zoom out animations in panorama

To disable animations in Panorama

1. Type about:config in address bar and process further by agreeing to the warning.

2. Find  browser.panorama.animate_zoom  entry, double click on it to set its value to false.

Now you can feel the difference in access speed of Panorama.