Examine source code of Bookmark Pruner

{
  "icons": {
    "16": "icon16.plasmo.2577fc03.png",
    "32": "icon32.plasmo.d583dc1e.png",
    "48": "icon48.plasmo.e0fcfb1d.png",
    "64": "icon64.plasmo.e6259081.png",
    "128": "icon128.plasmo.96a1ede9.png"
  },
  "manifest_version": 3,
  "action": {
    "default_icon": {
      "16": "icon16.plasmo.2577fc03.png",
      "32": "icon32.plasmo.d583dc1e.png",
      "48": "icon48.plasmo.e0fcfb1d.png",
      "64": "icon64.plasmo.e6259081.png",
      "128": "icon128.plasmo.96a1ede9.png"
    },
    "default_popup": "popup.html"
  },
  "version": "0.1.0",
  "author": "Pedro Martins <pedrosbarbosamartins@gmail.com>",
  "name": "Bookmark Pruner",
  "description": "A low-effort solution for dealing with your ever-growing collection of bookmarks.",
  "background": {
    "scripts": [
      "static/background/index.js"
    ]
  },
  "permissions": [
    "storage",
    "activeTab",
    "bookmarks",
    "webRequest"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.41e90f09.js"
      ],
      "all_frames": true,
      "css": [
        "font.b8bcf384.css",
        "font.b8bcf384.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "bookmark-pruner@pedrosbmartins.github.io"
    }
  },
  "host_permissions": [
    "https://*/*"
  ],
  "commands": {
    "load-random-bookmark": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "Command+Shift+Y"
      },
      "description": "Load a random bookmark."
    }
  },
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "Roboto-Regular.29557c70.woff2",
        "Roboto-Light.e9036715.woff2",
        "Roboto-Thin.36d1ac2c.woff2",
        "RobotoMono.adb8d30d.woff2",
        "content.b297b04c.png",
        "content.0c2ad4be.png",
        "content.0a3905ba.css",
        "Roboto-Regular.29557c70.woff2",
        "Roboto-Light.e9036715.woff2",
        "Roboto-Thin.36d1ac2c.woff2",
        "RobotoMono.adb8d30d.woff2"
      ]
    }
  ]
}