joewalker/devtools-window — pull request #245 by paulrouget (2012-11-15 16:43:21+00:00)
Title: Set the "checked" status on the broadcaster. Fixes issue #22

I do several things here:

1. rename the register/forget function, for consistency
2. use a `Set()` to store references to browser windows
3. use the broadcaster to set the sate of the buttons