Examine source code of Simple QrCode

{
  "manifest_version": 2,
  "name": "Simple QR Code",
  "version": "1.4.1",
  "description": "Adds a button to the address bar to generate a qr code of the url.",
  "icons": {
    "48": "./icons/icon.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "webRequest"
  ],
  "options_ui": {
    "page": "./options/options.html"
  },
  "page_action": {
    "default_icon": {
      "48": "./icons/icon.png"
    },
    "show_matches": [
      "<all_urls>"
    ],
    "default_title": "Simple QR Code",
    "default_popup": "./src/index.html?popup=true"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./index.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "eneskavcakar@simpleqrcode"
    }
  }
}