Extended Statusbar is another useful Firefox extension which adds functionality to the web browser that would otherwise not be available. It displays additional information about the website that is currently loaded in the browser's statusbar.
The information include the overall time the page load of the website took, the amount of bytes that have been downloaded, the speed with which your computer has downloaded the page to your computer, the number of loaded images, and finally a load indicator in percent that helps you understand how much longer a site will be loaded before it becomes fully available.
The information are useful if you want to find out why a website is loading slower than others for instance, or if you want indicators as to how long a loading site will take before it is fully displayed on your screen. Webmasters are also able to check out their websites and see how fast it really loads for them.
Update: Extended Statusbar is still available for the Firefox web browser, despite Mozilla's drive to remove the status bar from the browser. Firefox users may need to display the status bar in the browser after installing the extension to see the new information displayed there. This is done with a click on the Firefox button at the top, and the selection of Options > Add-on Bar.
Once you have enabled the status bar, you should see the information that the extension adds to it automatically. The extension has however not been updated for a year (as of May 2012) which may indicate that the author has abandoned the add-on, or at least put it on ice. There is unfortunately no alternative available at this point in time.
Update: It is interesting to note that the extension is still available and working with all recent versions of the Firefox web browser. You need to restart the browser after installation and will notice that statistics about the loaded images, total size of the web page, speed and time have been added to the browser's add-on bar.
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