Install via Atom package manager. Or from the command line.
$ apm install ws-toolbox
Configure; i.e., explore Settings page in Atom; (screenshot below).
To learn keyboard shortcuts, please see:
Atom → Main Menu Bar → Packages → WebSharks Toolbox
This will show you the available commands & their keyboard shortcuts.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.