Examine source code of tabdetach

{
  "description": "detach, attach, merge and quick jump tabs",
  "manifest_version": 2,
  "name": "tabdetach",
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "permissions": [
    "tabs"
  ],
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png"
  },
  "version": "1.2resigned1",
  "applications": {
    "gecko": {
      "id": "tabenhanced@firefox"
    }
  },
  "background": {
    "scripts": [
      "background/detach.js",
      "background/ctrlnumber.js"
    ]
  },
  "commands": {
    "detach-toggle": {
      "suggested_key": {
        "default": "Alt+Shift+D"
      },
      "description": "detach active tab to new window"
    },
    "attach-toggle": {
      "suggested_key": {
        "default": "Alt+Shift+A"
      },
      "description": "attach tab to detached window"
    },
    "merge-tabs": {
      "suggested_key": {
        "default": "Alt+Shift+M"
      },
      "description": "merge all open tabs in one window"
    },
    "switch-tab-1": {
      "description": "switch to the first tab",
      "suggested_key": {
        "default": "Ctrl+1"
      }
    },
    "switch-tab-2": {
      "description": "switch to the second tab",
      "suggested_key": {
        "default": "Ctrl+2"
      }
    },
    "switch-tab-3": {
      "description": "switch to the third tab",
      "suggested_key": {
        "default": "Ctrl+3"
      }
    },
    "switch-tab-4": {
      "description": "switch to the fourth tab",
      "suggested_key": {
        "default": "Ctrl+4"
      }
    },
    "switch-tab-5": {
      "description": "switch to the fifth tab",
      "suggested_key": {
        "default": "Ctrl+5"
      }
    },
    "switch-tab-6": {
      "description": "switch to the sixth tab",
      "suggested_key": {
        "default": "Ctrl+6"
      }
    },
    "switch-tab-7": {
      "description": "switch to the seventh tab",
      "suggested_key": {
        "default": "Ctrl+7"
      }
    },
    "switch-tab-8": {
      "description": "switch to the eighth tab",
      "suggested_key": {
        "default": "Ctrl+8"
      }
    },
    "switch-tab-9": {
      "description": "switch to the last tab",
      "suggested_key": {
        "default": "Ctrl+9"
      }
    }
  }
}