Simple example extension that uses keyboard shortcut

[ehamiter]

I'm trying to write an extension that uses a keyboard shortcut to open
a window. I've pored over keyset documentation, and tried to look into
extensions that make use of keyboard shortcuts, but the vast majority
are really complicated extensions with way more code than I need to
look at, so it's hard to comprehend.

Is there a small, very basic (even trivial) extension that anyone
knows of that uses keyboard shortcuts? I'd like to go through the code
and see how it ticks.

Thanks.