Examine source code of Plente

{
  "manifest_version": 2,
  "name": "Planet Plus",
  "short_name": "planet-plus",
  "version": "3.0.2",
  "description": "Wtyczka dla użytkowników planetplus.com",
  "browser_action": {
    "default_title": "Planet plus",
    "default_popup": "pages/popup.html",
    "default_icon": "assets/logo.png"
  },
  "author": "Planet Plus",
  "background": {
    "page": "pages/background.html"
  },
  "homepage_url": "https://planetplus.com/",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "pages/index.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "assets/*",
    "icons/*"
  ],
  "permissions": [
    "tabs",
    "activeTab",
    "http://*/*",
    "https://*/*",
    "file:///*",
    "webNavigation",
    "storage",
    "cookies"
  ],
  "minimum_chrome_version": "60",
  "icons": {
    "16": "assets/logo.png",
    "48": "assets/logo.png",
    "128": "assets/logo128.png"
  }
}