Examine source code of QRShare

{
  "manifest_version": 2,
  "name": "QRShare",
  "version": "0.2.1",
  "description": "A lightweight and simple Firefox extension for sharing text/links around using QR codes. Minimal and non-obtrusive.",
  "icons": {
    "64": "icons/qrcode-64.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8c18cabf-d8ac-4959-9616-7f39f4092a85}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "menus"
  ],
  "page_action": {
    "default_icon": {
      "64": "icons/qrcode-64.png"
    },
    "default_title": "Get QR Code for this URL",
    "default_popup": "popup/index.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "developer": {
    "name": "Orix Au Yeung",
    "url": "https://solsyn.dev"
  }
}