Examine source code of ZmartBag Shopping Button

{
  "name": "ZmartBag Shopping Button",
  "author": "ZmartBag Developer",
  "short_name": "ZmartBag",
  "version": "0.94.1",
  "description": "Zmartbag is a aggregated shopping cart where you can gather products from all over the web and collect and checkout from one place.",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@zmartbag.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "build/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "assets/icons/icon-16x16.png",
    "48": "assets/icons/icon-48x48.png",
    "128": "assets/icons/icon-128x128.png",
    "192": "assets/icons/icon-192x192.png"
  },
  "options_ui": {
    "page": "src/options.html",
    "open_in_tab": true
  },
  "homepage_url": "https://zmartbag.com",
  "background": {
    "scripts": [
      "build/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "ZmartBag",
    "default_icon": "assets/icons/icon-192x192.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "*://gateway.zmartbag.com/*",
    "*://gateway.zmartbag.marvin.larvit.se/*"
  ],
  "web_accessible_resources": [
    "build/productProof.js",
    "assets/images/logo_with_text.svg",
    "assets/images/arrow.svg",
    "assets/images/save_item.svg",
    "assets/icons/icon-192x192.png"
  ]
}