Examine source code of Inbundly – Inbox Bundles for Gmail

{
  "name": "Inbundly",
  "version": "4.4.0",
  "description": "Bring Google Inbox-style bundles to Gmail: auto-group emails by label into tidy, collapsible bundles. Organize your inbox, fast.",
  "homepage_url": "https://inbundly.com",
  "browser_specific_settings": {
    "gecko": {
      "id": "inbundly@benoror.github.io",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://mail.google.com/mail/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "browser_style": false,
    "open_in_tab": true
  },
  "permissions": [
    "storage",
    "declarativeContent"
  ],
  "action": {
    "default_icon": {
      "16": "icons/inbundly-dark-16.png",
      "24": "icons/inbundly-dark-24.png",
      "32": "icons/inbundly-dark-32.png",
      "48": "icons/inbundly-dark-48.png"
    },
    "theme_icons": [
      {
        "light": "icons/inbundly-dark-16.png",
        "dark": "icons/inbundly-light-16.png",
        "size": 16
      },
      {
        "light": "icons/inbundly-dark-24.png",
        "dark": "icons/inbundly-light-24.png",
        "size": 24
      },
      {
        "light": "icons/inbundly-dark-32.png",
        "dark": "icons/inbundly-light-32.png",
        "size": 32
      },
      {
        "light": "icons/inbundly-dark-48.png",
        "dark": "icons/inbundly-light-48.png",
        "size": 48
      }
    ],
    "default_popup": "popup/popup.html",
    "show_matches": [
      "*://mail.google.com/mail/*"
    ]
  },
  "icons": {
    "16": "icons/inbundly-dark-16.png",
    "32": "icons/inbundly-dark-32.png",
    "48": "icons/inbundly-dark-48.png",
    "128": "icons/inbundly-dark-128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "assets/*.svg"
      ],
      "matches": [
        "https://mail.google.com/*"
      ]
    }
  ],
  "manifest_version": 3
}