devtools_profile

CPU profiler. start/stop a sampling profile (.cpuprofile artifact, opens in DevTools Performance/JavaScript Profiler). stop and analyze return a bottom-up list of expensive functions (self time) and a call tree of hot paths.

The tool names stay the same across browsers. See browser selection and Firefox and Zen exceptions before choosing an operation.

Parameters

integer

Target tab id from browser_tabs, which lists tabs across all windows. Defaults to the agent’s most recently opened usable tab, or the only usable tab. Otherwise select a listed tabId.

enum

required

One of: start, stop, analyze, list.

integer

string

integer

Example

{
  "tabId": 1234,
  "action": "start",
  "samplingIntervalUs": 500
}

{
  "tabId": 1234,
  "action": "stop",
  "limit": 20
}

Browser automation

Developer tools

Parameters

Example

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Parameters

Example