Examine source code of Flag Bookmarks

{
  "manifest_version": 3,
  "name": "Flag Bookmarks",
  "version": "1.1.0",
  "description": "Drop flag markers anywhere on any webpage. Jump back to that exact spot and scroll position, anytime.",
  "browser_specific_settings": {
    "gecko": {
      "id": "flag-bookmarks@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/flag16.png",
      "32": "icons/flag32.png",
      "48": "icons/flag48.png",
      "128": "icons/flag128.png"
    }
  },
  "icons": {
    "16": "icons/flag16.png",
    "32": "icons/flag32.png",
    "48": "icons/flag48.png",
    "128": "icons/flag128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/flag.png",
        "icons/flag16.png",
        "icons/flag32.png",
        "icons/flag48.png",
        "icons/flag128.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}