Examine source code of dddice

{
  "name": "dddice",
  "description": "Roll 3D digital dice using your favorite browser-based VTT.",
  "manifest_version": 2,
  "version": "0.11.9",
  "browser_specific_settings": {
    "gecko_android": {},
    "gecko": {
      "id": "{87033b3f-6fa3-4046-b74f-76053b40c231}"
    }
  },
  "browser_action": {
    "default_title": "dddice",
    "default_popup": "dddice-browser-extension.0c9b476b.html",
    "default_icon": {
      "16": "dddice-16x16.d7fe0ee6.png",
      "32": "up_/assets/dddice-32x32.png"
    }
  },
  "icons": {
    "16": "dddice-16x16.d7fe0ee6.png",
    "32": "up_/assets/dddice-32x32.png",
    "48": "up_/assets/dddice-48x48.png",
    "128": "dddice-128x128.5e6d9c61.png"
  },
  "background": {
    "scripts": [
      "background.52dae1e5.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "js": [
        "dndbeyond.9330f2d0.js"
      ],
      "css": [
        "up_/dndbeyond.css"
      ],
      "matches": [
        "*://*.dndbeyond.com/*"
      ],
      "run_at": "document_idle",
      "all_frames": true
    },
    {
      "js": [
        "roll20.c6249502.js"
      ],
      "css": [
        "up_/roll20.css"
      ],
      "matches": [
        "*://app.roll20.net/editor"
      ],
      "run_at": "document_idle"
    },
    {
      "js": [
        "dungeonmastersvault.3060ab52.js"
      ],
      "css": [
        "up_/dungeonmastersvault.css"
      ],
      "matches": [
        "*://www.dungeonmastersvault.com/pages/dnd/5e/*"
      ],
      "run_at": "document_idle"
    },
    {
      "js": [
        "pathbuilder2e.563ee1da.js"
      ],
      "css": [
        "up_/pathbuilder2e.css"
      ],
      "matches": [
        "*://*.pathbuilder2e.com/*"
      ],
      "run_at": "document_idle"
    },
    {
      "js": [
        "tabyltop.edc280a0.js"
      ],
      "matches": [
        "*://*.tabyltop.com/*"
      ],
      "run_at": "document_idle",
      "css": []
    }
  ],
  "permissions": [
    "storage",
    "tabs",
    "https://cdn.dddice.com/*",
    "https://dddice.com/*"
  ],
  "web_accessible_resources": [
    "up_/dndbeyond.css",
    "up_/assets/dddice-32x32.png",
    "up_/roll20.css",
    "up_/assets/dddice-48x48.png",
    "up_/dungeonmastersvault.css",
    "up_/pathbuilder2e.css",
    "dddice-32x32.d8b43518.png",
    "dddice-48x48.8084963d.png"
  ]
}