Examine source code of Fresh News

{
  "manifest_version": 2,
  "name": "Fresh News",
  "description": "Graying out news, posts and messages you have already seen.",
  "author": "Sergey Vlasov",
  "version": "1.1.0",
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*",
    "storage",
    "unlimitedStorage"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "SeenLink.js",
      "background.js",
      "NewsPageFormatOptions.js",
      "NewsPageFormat.js",
      "InternalOptions.js",
      "Options.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "LinkNode.js",
        "NewsFormat.js",
        "NewsParent.js",
        "Parser.js",
        "tinycolor.js",
        "Styler.js",
        "main.js",
        "NewsPageFormatOptions.js",
        "InternalOptions.js"
      ]
    }
  ],
  "options_ui": {
    "page": "Options.html"
  },
  "web_accessible_resources": [
    "internal-options.html"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'"
}