Examine source code of Cart Merge

{
  "action": {
    "default_icon": "/images/sac-16.png",
    "default_title": "__MSG_extensionName__"
  },
  "background": {
    "scripts": [
      "/js/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c0357452-ac3b-5d2f-1b73-f581993f9bb9}"
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "/js/sac.js"
      ],
      "matches": [
        "https://*.share-a-cart.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "description": "__MSG_appDesc__",
  "host_permissions": [
    "https://*/*",
    "http://*/*"
  ],
  "icons": {
    "16": "/images/sac-16.png",
    "64": "/images/sac-64.png",
    "128": "/images/sac-128.png"
  },
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "options_ui": {
    "open_in_tab": true,
    "page": "/options_page.html"
  },
  "permissions": [
    "alarms",
    "clipboardWrite",
    "storage",
    "unlimitedStorage",
    "tabs",
    "cookies",
    "activeTab",
    "scripting"
  ],
  "version": "3.0.6",
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "/images/*"
      ]
    }
  ]
}