Examine source code of doogle

{
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "48.0"
    }
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Doogle",
    "default_popup": "tabs.html"
  },
  "description": "A list of methods you can perform on a tab.",
  "homepage_url": "https://github.com/mdn/webextensions-examples/tree/master/tabs-tabs-tabs",
  "manifest_version": 2,
  "name": "Bienvenue sur Doogle !",
  "version": "1.0",
  "page_action": {
    "default_icon": "icons/icon.png",
    "browser_style": true
  },
  "permissions": [
    "activeTab",
    "tabs"
  ]
}