Rated 4 out of 5 stars
Awesome addon, saved me the trouble of making it for myself!
1 - The progress bar isn't hidden after loading is complete. This was the behaviour of the old status bar.
2 - Wasn't added automatically at install for me; of course it was a simple matter of right-clicking the addon bar and using Customize... to drag elements on.
There is an option in the extension preference to control if the progress bar item is hidden or not. By default, it should be hidden.