Whether you are concerned with bandwidth, want to stay on top of your speed, or would like to see how fast pages are loading, this status bar can provide you with the information you need. Similar to Opera’s status bar, this one provides you not only with stats like those above but also with the percentages of pages that have been downloaded. This is a great way for you to see whether your pages are continuing to load or have frozen, as well as to see how long it may take for a particular page to load.
The add-on is open source and encourages feedback from its users. You can find the code at https://github.com/kustodian/extended-statusbar. It is listed under the GPLv3 license. If you would like to help the developers with additional translations, you can do so by applying at http://www.babelzilla.org/.