Examine source code of Plena Vortaro

{
  "name": "Plena Vortaro",
  "description": "Ĉi tio estas neoficiala aldonaĵo de PIV.",
  "version": "1.3.0",
  "manifest_version": 2,
  "icons": {
    "16": "icons/on_16.png",
    "32": "icons/on_32.png",
    "128": "icons/on_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "inject.js"
      ],
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Plena Vortaro",
    "default_popup": "popup/index.html",
    "default_icon": {
      "16": "icons/on_16.png",
      "32": "icons/on_32.png",
      "128": "icons/on_128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "janmichalak@int.pl"
    }
  },
  "author": "Jan Michalak",
  "permissions": [
    "storage",
    "https://vortaro.net/*"
  ]
}