Firefox 4 brings a lot of new features and a refreshing minimalistic user-interface, in the new design the back/forward buttons don't feature the handy drop down history list arrow but worry not, the feature is still there and all you need to do is to right-click the button(s) to make the "back/forward history drop-down list" appear.

Firefox displays a confirmation dialog box with a short delay when you install an extension preventing you from mistakenly confirm the install providing adequate time to review the install information, this is a very good security feature and prevents several cleverly crafted arbitrary code execution holes.

However if you are an advanced user and would like to disable or decrease the install dialog box delay, follow the steps below: