Examine source code of ReadRadar SCIU

{
  "manifest_version": 2,
  "name": "ReadRadar SCIU",
  "version": "2.0.0",
  "description": "Estimate reading time, collect article notes, and keep a local reading list with progress markers.",
  "icons": {
    "48": "icon.png",
    "96": "icon.png",
    "128": "icon.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon48.png"
    },
    "default_popup": "popup.html",
    "default_title": "ReadRadar"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      },
      "id": "{1479f834-76e8-4505-8f9d-1fe0cdc26cb1}"
    }
  },
  "action": {
    "default_popup": "popup.html"
  }
}