Examine source code of Trustium

{
  "name": "Trustium",
  "short_name": "Trustium",
  "version": "2.51",
  "id": "Trustium-sdf23-asdf-1234-asdc",
  "description": "Trustium analyzes the text of online news articles you read and determines credibility.",
  "permissions": [
    "webNavigation",
    "activeTab",
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "getColor.js",
      "background.js",
      "blocked.js"
    ],
    "persistent": true
  },
  "applications": {
    "gecko": {
      "id": "trustie_extension@trustie.online",
      "strict_min_version": "57.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": false,
      "run_at": "document_idle",
      "exclude_matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "getColor.js",
        "clean.js",
        "cache.js",
        "blocked.js",
        "feedback.js",
        "getPagesSource.js"
      ],
      "css": [
        "page_styles.css"
      ]
    }
  ],
  "page_action": {
    "default_icon": "images/trustie_icon-128.png",
    "default_popup": "popup.html",
    "browser_style": true
  },
  "icons": {
    "16": "images/trustie_icon-16.png",
    "32": "images/trustie_icon-32.png",
    "48": "images/trustie_icon-48.png",
    "128": "images/trustie_icon-128.png"
  },
  "manifest_version": 2
}