Examine source code of Remove Tabs By Misuta

{
  "name": "Remove Tabs By Misuta",
  "description": "Press Alt+Q to Remove Right Tabs, Press Alt+C to Remove Other Tabs.",
  "manifest_version": 2,
  "version": "1.1resigned1",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png"
  },
  "permissions": [
    "contextMenus",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "right": {
      "suggested_key": {
        "default": "Alt+Q"
      },
      "description": "Send a 'right' event"
    },
    "other": {
      "suggested_key": {
        "default": "Alt+C"
      },
      "description": "Send a 'other' event"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a955e486-e822-4b41-90a4-bb004bc007ec}"
    }
  }
}