firefox-devtools-mcpTools Reference

screenshot_by_uid

Capture specific element screenshot

Capture a screenshot of a specific element.

Parameters

Parameter	Type	Required	Description
`uid`	string	Yes	Element UID from snapshot

{
  "tool": "screenshot_by_uid",
  "arguments": {
    "uid": "uid-chart-container"
  }
}

Returns the element screenshot as base64-encoded image data.

screenshot_page

Capture full page screenshot

accept_dialog

Accept dialog/alert