Bugs that we know of

Saying "google x" doesn't google it
Bob doesn't work out of the box (i.e, on the extension page or a regular new tab page. You have to go to a site first.)
Closing a tab only works with tabs created after Bob has been initialized
Commands only work on pages where JavaScript is enabled

Improvements

An easy way to turn on and turn off Bob (binding an action to pressing the extension button)
Indication that Bob is working after you click the button
Not failing silently
Identifying text boxes for typing and typing in said boxes
New extension icon
Clean up the code (lol)