Examine source code of Roller

{
  "manifest_version": 3,
  "name": "Roller",
  "description": "Enable auto scrolling with the mouse wheel button on Linux",
  "minimum_chrome_version": "88",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options_page.html"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "content_script.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c0b65bfc-5191-4489-b2ed-4052c055e9b2}"
    }
  },
  "version": "2.0.0"
}