Examine source code of Fact Layer

{
  "manifest_version": 2,
  "name": "Fact Layer",
  "version": "2.0.0.0",
  "description": "Fact checking resource to help navigate the internet.",
  "icons": {
    "48": "icons/fact-layer.png",
    "96": "icons/fact-layer-2x.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "*://factlayer.azurewebsites.net/*",
    "webRequest"
  ],
  "browser_action": {
    "default_icon": "icons/unknown_default.png",
    "default_title": "Fact Layer",
    "default_popup": "popup/popup.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "fact.layer.utilities.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "site_js/site.utilities.js",
        "site_js/reddit.js"
      ],
      "css": [
        "site_css/reddit.css"
      ]
    },
    {
      "matches": [
        "*://digg.com/*"
      ],
      "js": [
        "site_js/site.utilities.js",
        "site_js/digg.js"
      ],
      "css": [
        "site_css/digg.css"
      ]
    },
    {
      "matches": [
        "*://*.fark.com/*"
      ],
      "js": [
        "site_js/site.utilities.js",
        "site_js/fark.js"
      ],
      "css": [
        "site_css/fark.css"
      ]
    },
    {
      "matches": [
        "https://*.counter.social/*"
      ],
      "js": [
        "site_js/site.utilities.js",
        "site_js/mastodon.js"
      ],
      "css": [
        "site_css/mastodon.css"
      ]
    },
    {
      "matches": [
        "*://*.slashdot.org/*",
        "*://slashdot.org/*"
      ],
      "js": [
        "site_js/site.utilities.js",
        "site_js/slashdot.js"
      ],
      "css": [
        "site_css/slashdot.css"
      ]
    },
    {
      "matches": [
        "*://getpocket.com/*"
      ],
      "js": [
        "site_js/site.utilities.js",
        "site_js/getpocket.js"
      ],
      "css": [
        "site_css/getpocket.css"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "{a1dd1fdc-b274-43bb-b13a-81fb8bb3b913}"
    }
  }
}