Examine source code of C2 Addon Installer

{
  "manifest_version": 2,
  "name": "Addon Installer",
  "version": "0.0.8",
  "author": "Armaldio",
  "description": "Install C2 plugins directly to your computer from the addon list",
  "icons": {
    "128": "icons/border-128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/border-48.png",
    "default_title": "Addon Installer"
  },
  "background": {
    "persistent": true,
    "scripts": [
      "sprint.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.construct.net/construct-2/addons*",
        "*://*.scirra.com/*",
        "<all_urls>"
      ],
      "js": [
        "sprint.js",
        "installer.js"
      ],
      "css": [
        "installer.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/border-48.png"
  ]
}