Examine source code of ShadowGag

{
  "manifest_version": 2,
  "name": "ShadowGag",
  "version": "1.0",
  "description": "Detects shadowbanned comments on 9gag",
  "permissions": [
    "storage",
    "*://*.9gag.com/*",
    "*://comment-cdn.9gag.com/*"
  ],
  "background": {
    "scripts": [
      "background.js",
      "background-firefox.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.9gag.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_title": "ShadowGag - Configure settings",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    "icons/*.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c0a1c8a1-330a-4c68-ad0c-2f9e03a9dad7}"
    }
  }
}