Examine source code of NiceDump Inspector

{
  "manifest_version": 2,
  "version": "1.0.1resigned1",
  "short_name": "NiceDump",
  "name": "NiceDump Inspector",
  "description": "Read and inspect NiceDumps on web pages.",
  "homepage_url": "https://nicedump.net/",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon-16.png",
      "32": "icon-32.png",
      "48": "icon-48.png",
      "128": "icon-128.png"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5f547004-8686-48eb-9149-e8fcf9a41d0c}"
    }
  }
}