Examine source code of Next Space Flight

{
  "manifest_version": 3,
  "name": "Next Space Launch",
  "version": "1.2",
  "author": "LazJedi",
  "browser_specific_settings": {
    "gecko": {
      "id": "{307c39db-884a-4da7-9e64-8ec8e8975254}",
      "strict_min_version": "109.0"
    }
  },
  "description": "To be informed about rocket launches.",
  "icons": {
    "48": "icons/icon-32.png"
  },
  "action": {
    "default_icon": {
      "32": "icons/icon-32.png"
    },
    "default_title": "NextSpaceLaunch",
    "default_popup": "popup/index.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*"
      ],
      "matches": [
        "*://*/*"
      ]
    },
    {
      "resources": [
        "/popup/style.css",
        "/popup/script.js"
      ],
      "matches": [
        "https://ll.thespacedevs.com/*"
      ]
    }
  ]
}