Rated 4 out of 5 stars
Nice addon! As suggested by battousan, the feature of auto hiding/showing the bars on mouse hover would greatly enhance the usability. I am currently using Autohide Tabbar extension for this purpose.
Similar to the feature where on Ctrl+L or O, the bars are displayed, it can be extended to other shortcuts used to show up status bar. For instance, I use Status bar scientific calculator, which has a shortcut of Ctrl+Spacebar to open and close the calculator. So, when I press this shortcut, ONLY the status bar should appear.
Otherwise, it is a very useful extension!! Good job and thanks.