I find this very useful. There are only a couple of fixes I would like to see in the future:
1) In Facebook, with Owl enabled, the small Messenger window is rendered useless because it doesn't stay in place. The top Facebook bar also doesn't stay in place. And it is impossible to go to the top of the page with keyboard commands -- only by scrolling up with the mouse.
2) In Youtube, with Owl enabled, videos are somewhat choppy. In fullscreen, or with Owl disabled, they run smoothly.
I hope these problems are fixed, so that Owl becomes even better. Thank you.