This extension adds a progress bar to Firefox 4 and up.
Installation of this add-on only places the ProgressMeter button on the Firefox Customize Toolbar.
In order to use this extension, right click the Navigation Toolbar and choose Customize.
Then drag the ProgressMeter button to any one of the following locations:
Menu Bar, Navigation Toolbar, Bookmarks Toolbar, Add-on Bar, or next to a Tab.
Close the Customize Toolbar. The button disappears and the ProgressMeter extension is now installed.