Examine source code of Send to Everdo

{
  "manifest_version": 3,
  "name": "Send to Everdo",
  "version": "1.0.0",
  "description": "Capture selected text and send it to Everdo Inbox",
  "permissions": [
    "contextMenus",
    "notifications",
    "activeTab"
  ],
  "host_permissions": [
    "http://localhost:44556/*",
    "http://127.0.0.1:44556/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "send-to-everdo@everdo.net",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}