Examine source code of Nerimity RPC

{
  "manifest_version": 3,
  "permissions": [
    "storage"
  ],
  "name": "Nerimity RPC",
  "version": "0.3.1",
  "description": "Share your playing Spotify music or YouTube video details with users on Nerimity!",
  "action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    {
      "matches": [
        "https://open.spotify.com/*"
      ],
      "resources": [
        "WebSocketRPC.js",
        "ExtensionRPC.js",
        "options.js",
        "utils.js"
      ]
    },
    {
      "matches": [
        "https://*.youtube.com/*"
      ],
      "resources": [
        "WebSocketRPC.js",
        "ExtensionRPC.js",
        "options.js",
        "utils.js",
        "youtube_inject.js"
      ]
    },
    {
      "matches": [
        "https://atomic.radio/*"
      ],
      "resources": [
        "WebSocketRPC.js",
        "ExtensionRPC.js",
        "options.js",
        "utils.js"
      ]
    }
  ],
  "content_scripts": [
    {
      "js": [
        "youtube_content.js"
      ],
      "run_at": "document_start",
      "matches": [
        "https://*.youtube.com/*"
      ]
    },
    {
      "js": [
        "spotify_content.js"
      ],
      "run_at": "document_start",
      "matches": [
        "https://open.spotify.com/*"
      ]
    },
    {
      "js": [
        "nerimity_content.js"
      ],
      "run_at": "document_start",
      "matches": [
        "https://nerimity.com/*",
        "http://local.nerimity.com/*"
      ]
    },
    {
      "js": [
        "atomicradio_content.js"
      ],
      "run_at": "document_start",
      "matches": [
        "https://atomic.radio/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "service_worker.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "info@nerimity.com",
      "strict_min_version": "58.0"
    }
  }
}