Examine source code of Ctrl Tabs

{
  "manifest_version": 2,
  "name": "Ctrl Tabs",
  "version": "0.2resigned1",
  "description": "Allows changing to a different tab by pressing Ctrl and a number.",
  "developer": {
    "name": "Mikel Ward",
    "url": "https://mikelward.com"
  },
  "permissions": [
    "background"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "tab1": {
      "suggested_key": {
        "default": "Ctrl+1"
      },
      "description": "Change to 1st tab"
    },
    "tab2": {
      "suggested_key": {
        "default": "Ctrl+2"
      },
      "description": "Change to 2nd tab"
    },
    "tab3": {
      "suggested_key": {
        "default": "Ctrl+3"
      },
      "description": "Change to 3rd tab"
    },
    "tab4": {
      "suggested_key": {
        "default": "Ctrl+4"
      },
      "description": "Change to 4th tab"
    },
    "tab5": {
      "suggested_key": {
        "default": "Ctrl+5"
      },
      "description": "Change to 5th tab"
    },
    "tab6": {
      "suggested_key": {
        "default": "Ctrl+6"
      },
      "description": "Change to 6th tab"
    },
    "tab7": {
      "suggested_key": {
        "default": "Ctrl+7"
      },
      "description": "Change to 7th tab"
    },
    "tab8": {
      "suggested_key": {
        "default": "Ctrl+8"
      },
      "description": "Change to 8th tab"
    },
    "tab9": {
      "suggested_key": {
        "default": "Ctrl+9"
      },
      "description": "Change to last tab"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{54c3b408-956e-4059-9699-4e74e55a61d7}"
    }
  }
}