This remote control extension is open source.

Once installed, you can set up a series of commands you would like to execute through the controller. You can add or remove commands, as well as set key combinations to launch these commands. Each command can take one or more arguments, which means you can execute a command with multiple arguments. The key combinations are defined by keys that you press on the keypad. Pressing them will set the corresponding command as a key combination. If you press more than one key on the keyboard, you can execute more than one command.

The extension connects to a remote server that collects the commands you have defined and executes them. The server will then forward any output it produces back to the extension so that it is available in the popup.