Examine source code of Immersive Reader – Kindle Mode

{
  "manifest_version": 2,
  "name": "Immersive Reader – Kindle Mode",
  "version": "2.0.0",
  "description": "Kindle-like reading mode with adaptive typography, distraction-free layout and built-in ad blocking.",
  "author": "Immersive Reader",
  "homepage_url": "https://github.com/immersive-reader",
  "icons": {
    "48": "icons/icon-48.svg",
    "96": "icons/icon-96.svg"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.svg"
    },
    "default_title": "Immersive Reading Mode",
    "default_popup": "popup/popup.html"
  },
  "commands": {
    "toggle-reader": {
      "suggested_key": {
        "default": "Alt+R"
      },
      "description": "Toggle immersive reading mode"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/malware-filter.js",
        "content/popup-killer.js",
        "content/adblocker.js"
      ],
      "css": [
        "content/reader.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/reader.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "<all_urls>"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "immersive-reader-kindle@addon",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}