Examine source code of Shar.fr

{
  "manifest_version": 2,
  "name": "Shar.fr",
  "version": "1.4",
  "description": "Ajout d'un menu (clic-droit) pour raccourcir et copier automatiquement les URL de lien et d'image.",
  "homepage_url": "https://shar.fr",
  "icons": {
    "48": "icons/shar.png"
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "contextMenus",
    "clipboardWrite"
  ],
  "background": {
    "scripts": [
      "sharBG.js"
    ]
  }
}