background.js

/**
 * Returns all of the registered extension commands for this extension
 * and their shortcut (if active).
 *
 * Since there is only one registered command in this sample extension,
 * the returned `commandsArray` will look like the following:
 *    [{
 *       name: "toggle-feature",
 *       description: "Send a 'toggle-feature' event to the extension"
 *       shortcut: "Ctrl+Shift+U"
 *    }]
 */
var gettingAllCommands = browser.commands.getAll();
gettingAllCommands.then((commands) => {
    for (let command of commands) {
        console.log(command);
    }
});

/**
 * Fired when a registered command is activated using a keyboard shortcut.
 *
 * In this sample extension, there is only one registered command:
 * "Ctrl+Shift+U". On Mac, this command will automatically be converted to
 * "Command+Shift+U".
 */
browser.commands.onCommand.addListener((command) => {
    console.log('onCommand event received for message: ', command);
});