FeatureRequest - keyboard binding to close tab.

[pigeonlips]

I'm a big keyboard fan, so it goes without saying that i love this extension.

one thing i found missing was using the keyboard to close a tab. I know you have this via right click, but thought it would be nice to have a keyboard short cut. I've forked and tried it out. If you are interested i can raise a pull.

great work by the way. Simple but very helpful extension. I tip my hat to you sir.