Examine source code of SendToFreebox

{
  "manifest_version": 2,
  "name": "SendToFreebox",
  "version": "2.0",
  "description": "Envoie un lien vers la Freebox pour être téléchargé",
  "default_locale": "fr",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "32": "icons/32_download.png",
    "48": "icons/48_download.png",
    "96": "icons/96_download.png",
    "128": "icons/128_download.png"
  },
  "options_ui": {
    "page": "popup/popup.html"
  },
  "permissions": [
    "menus",
    "contextMenus",
    "storage",
    "http://*/",
    "https://*/"
  ],
  "applications": {
    "gecko": {
      "id": "SendToFreebox@SendToFreebox.com"
    }
  },
  "browser_action": {
    "default_icon": "icons/32_download.png",
    "default_title": "Send To Freebox",
    "default_popup": "popup/popup.html",
    "browser_style": true
  },
  "background": {
    "scripts": [
      "common.js",
      "SendLink.js",
      "sha1.js"
    ]
  }
}