Examine source code of DeepMaps

{
  "description": "Browse online maps as if they were hand-drawn in the 19th century!",
  "manifest_version": 2,
  "name": "DeepMaps",
  "version": "1.3.1",
  "homepage_url": "https://github.com/nathanvogel/DeepMaps",
  "icons": {
    "48": "maps.svg",
    "96": "maps.svg"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "downloads",
    "storage",
    "http://localhost/*",
    "https://localhost/*",
    "https://*.openstreetmap.org/*",
    "https://raw.githubusercontent.com/*"
  ],
  "content_security_policy": "script-src 'self' ; object-src 'self'",
  "background": {
    "scripts": [
      "libs/ml5.min.js",
      "libs/blob-util.min.js",
      "libs/jimp.min.js",
      "defaults.js",
      "styleTransfer.js",
      "queryRunway.js",
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "applications": {
    "gecko": {
      "strict_min_version": "57.0a1",
      "id": "deepmaps@nathanvogel.github.io"
    }
  }
}