Examine source code of GithubProxyClick

{
  "manifest_version": 2,
  "name": "Github Proxy Click",
  "version": "1.3",
  "description": "Help downloading files from github moeyy",
  "icons": {
    "48": "icon.ico"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "menus",
    "contextMenus"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://github.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2758b3b3-a781-4c55-88ea-4125de0c5a43}"
    }
  }
}