Examine source code of Quick QR Code

{
  "browser_action": {
    "default_icon": "icon/128.png",
    "default_popup": "popup.html"
  },
  "author": "ulmdesign",
  "name": "Quick QR Code",
  "description": "Your quick QR Code generator",
  "icons": {
    "16": "icon/16.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "@qrcodegen",
      "strict_min_version": "57.0"
    }
  },
  "manifest_version": 2,
  "permissions": [
    "contextMenus",
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "js/jquery-3.4.1.js",
        "js/main.js"
      ]
    }
  ],
  "version": "1.5.0"
}