Examine source code of Better Google Chat

{
  "manifest_version": 3,
  "name": "Better Experience for Google Chat",
  "version": "1.1.2",
  "description": "A customizable UI/UX polish layer for Google Chat, with matching tweaks for its Gemini side panel.",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "better-gchat@main",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://chat.google.com/*"
      ],
      "js": [
        "src/content.js"
      ],
      "css": [
        "src/styles/features.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://gemini.google.com/*"
      ],
      "js": [
        "src/gemini.js"
      ],
      "css": [
        "src/styles/features.css"
      ],
      "run_at": "document_start"
    }
  ]
}