Examine source code of Wikipedia Context Menu

{
  "manifest_version": 2,
  "name": "Wikipedia Context Menu",
  "developer": {
    "name": "smt923",
    "url": "https://github.com/smt923"
  },
  "version": "0.0.4resigned1",
  "description": "Use the context menu to quickly lookup the selected text on Wikipedia.",
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "bg.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5737a280-b359-4e26-95b0-adec5915a854}"
    }
  }
}