Examine source code of Ctrl + Number for Group Speed Dial

{
  "manifest_version": 2,
  "name": "Ctrl + Number for Group Speed Dial",
  "version": "2.7resigned1",
  "description": "Makes dials in GroupSpeedDial add-on addressable by Ctrl + [0-9] keystrokes",
  "icons": {
    "48": "48.png",
    "128": "128.png"
  },
  "background": {
    "scripts": [
      "background_ctrl.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "commands": {
    "0": {
      "suggested_key": {
        "default": "Ctrl+0",
        "mac": "MacCtrl+0"
      },
      "description": "Open dial 10"
    },
    "1": {
      "suggested_key": {
        "default": "Ctrl+1",
        "mac": "MacCtrl+1"
      },
      "description": "Open dial 1"
    },
    "2": {
      "suggested_key": {
        "default": "Ctrl+2",
        "mac": "MacCtrl+2"
      },
      "description": "Open dial 2"
    },
    "3": {
      "suggested_key": {
        "default": "Ctrl+3",
        "mac": "MacCtrl+3"
      },
      "description": "Open dial 3"
    },
    "4": {
      "suggested_key": {
        "default": "Ctrl+4",
        "mac": "MacCtrl+4"
      },
      "description": "Open dial 4"
    },
    "5": {
      "suggested_key": {
        "default": "Ctrl+5",
        "mac": "MacCtrl+5"
      },
      "description": "Open dial 5"
    },
    "6": {
      "suggested_key": {
        "default": "Ctrl+6",
        "mac": "MacCtrl+6"
      },
      "description": "Open dial 6"
    },
    "7": {
      "suggested_key": {
        "default": "Ctrl+7",
        "mac": "MacCtrl+7"
      },
      "description": "Open dial 7"
    },
    "8": {
      "suggested_key": {
        "default": "Ctrl+8",
        "mac": "MacCtrl+8"
      },
      "description": "Open dial 8"
    },
    "9": {
      "suggested_key": {
        "default": "Ctrl+9",
        "mac": "MacCtrl+9"
      },
      "description": "Open dial 9"
    },
    "F4": {
      "suggested_key": {
        "default": "F4"
      },
      "description": "Open dial dials page"
    },
    "a1": {
      "suggested_key": {
        "default": "Alt+1",
        "mac": "Ctrl+1"
      },
      "description": "Open dial 1"
    },
    "a2": {
      "suggested_key": {
        "default": "Alt+2",
        "mac": "Ctrl+2"
      },
      "description": "Open dial 2"
    },
    "a3": {
      "suggested_key": {
        "default": "Alt+3",
        "mac": "Ctrl+3"
      },
      "description": "Open dial 3"
    },
    "a4": {
      "suggested_key": {
        "default": "Alt+4",
        "mac": "Ctrl+4"
      },
      "description": "Open dial 4"
    },
    "a5": {
      "suggested_key": {
        "default": "Alt+5",
        "mac": "Ctrl+5"
      },
      "description": "Open dial 5"
    },
    "a6": {
      "suggested_key": {
        "default": "Alt+6",
        "mac": "Ctrl+6"
      },
      "description": "Open dial 6"
    },
    "a7": {
      "suggested_key": {
        "default": "Alt+7",
        "mac": "Ctrl+7"
      },
      "description": "Open dial 7"
    },
    "a8": {
      "suggested_key": {
        "default": "Alt+8",
        "mac": "Ctrl+8"
      },
      "description": "Open dial 8"
    },
    "a9": {
      "suggested_key": {
        "default": "Alt+9",
        "mac": "Ctrl+9"
      },
      "description": "Open dial 9"
    },
    "a0": {
      "suggested_key": {
        "default": "Alt+0",
        "mac": "Ctrl+0"
      },
      "description": "Open dial 10"
    },
    "s1": {
      "suggested_key": {
        "default": "Ctrl+Shift+1",
        "mac": "MacCtrl+Shift+1"
      },
      "description": "Open dial 1"
    },
    "s2": {
      "suggested_key": {
        "default": "Ctrl+Shift+2",
        "mac": "MacCtrl+Shift+2"
      },
      "description": "Open dial 2"
    },
    "s3": {
      "suggested_key": {
        "default": "Ctrl+Shift+3",
        "mac": "MacCtrl+Shift+3"
      },
      "description": "Open dial 3"
    },
    "s4": {
      "suggested_key": {
        "default": "Ctrl+Shift+4",
        "mac": "MacCtrl+Shift+4"
      },
      "description": "Open dial 4"
    },
    "s5": {
      "suggested_key": {
        "default": "Ctrl+Shift+5",
        "mac": "MacCtrl+Shift+5"
      },
      "description": "Open dial 5"
    },
    "s6": {
      "suggested_key": {
        "default": "Ctrl+Shift+6",
        "mac": "MacCtrl+Shift+6"
      },
      "description": "Open dial 6"
    },
    "s7": {
      "suggested_key": {
        "default": "Ctrl+Shift+7",
        "mac": "MacCtrl+Shift+7"
      },
      "description": "Open dial 7"
    },
    "s8": {
      "suggested_key": {
        "default": "Ctrl+Shift+8",
        "mac": "MacCtrl+Shift+8"
      },
      "description": "Open dial 8"
    },
    "s9": {
      "suggested_key": {
        "default": "Ctrl+Shift+9",
        "mac": "MacCtrl+Shift+9"
      },
      "description": "Open dial 9"
    },
    "s0": {
      "suggested_key": {
        "default": "Ctrl+Shift+0",
        "mac": "MacCtrl+Shift+0"
      },
      "description": "Open dial 10"
    },
    "b1": {
      "suggested_key": {
        "default": "Alt+Shift+1",
        "mac": "Ctrl+Shift+1"
      },
      "description": "Open dial 1"
    },
    "b2": {
      "suggested_key": {
        "default": "Alt+Shift+2",
        "mac": "Ctrl+Shift+2"
      },
      "description": "Open dial 2"
    },
    "b3": {
      "suggested_key": {
        "default": "Alt+Shift+3",
        "mac": "Ctrl+Shift+3"
      },
      "description": "Open dial 3"
    },
    "b4": {
      "suggested_key": {
        "default": "Alt+Shift+4",
        "mac": "Ctrl+Shift+4"
      },
      "description": "Open dial 4"
    },
    "b5": {
      "suggested_key": {
        "default": "Alt+Shift+5",
        "mac": "Ctrl+Shift+5"
      },
      "description": "Open dial 5"
    },
    "b6": {
      "suggested_key": {
        "default": "Alt+Shift+6",
        "mac": "Ctrl+Shift+6"
      },
      "description": "Open dial 6"
    },
    "b7": {
      "suggested_key": {
        "default": "Alt+Shift+7",
        "mac": "Ctrl+Shift+7"
      },
      "description": "Open dial 7"
    },
    "b8": {
      "suggested_key": {
        "default": "Alt+Shift+8",
        "mac": "Ctrl+Shift+8"
      },
      "description": "Open dial 8"
    },
    "b9": {
      "suggested_key": {
        "default": "Alt+Shift+9",
        "mac": "Ctrl+Shift+9"
      },
      "description": "Open dial 9"
    },
    "b0": {
      "suggested_key": {
        "default": "Alt+Shift+0",
        "mac": "Ctrl+Shift+0"
      },
      "description": "Open dial 10"
    }
  },
  "applications": {
    "gecko": {
      "id": "admin@fastaddons.com_Ctrl_GroupSpeedDial",
      "strict_min_version": "51.0"
    }
  }
}