DevTools

Claudezilla provides browser DevTools capabilities through three tools that let you inspect console output, monitor network activity, and execute JavaScript in the page context.

firefox_get_console

Get captured console logs from the page. Captures console.log, console.warn, console.error, and uncaught exceptions. Works on background tabs.

Parameters

Parameter	Type	Required	Default	Description
tabId	number	No	Active tab	Target tab ID. Works on background tabs.
level	string	No	All levels	Filter by log level: log, warn, error, info, debug
clear	boolean	No	false	Clear logs after returning
limit	number	No	100	Maximum logs to return
timeout	number	No	150000	Request timeout in ms (5000-300000)

Example

// Get all console errors
const result = await firefox_get_console({ level: "error" });

// Get recent logs and clear the buffer
const result = await firefox_get_console({ limit: 20, clear: true });

// Check a specific tab's console
const result = await firefox_get_console({ tabId: 42, level: "warn" });

Notes

• Console capture is opt-in and must be enabled on the page.
• Logs accumulate until cleared. Use clear: true to reset the buffer after reading.
• Uncaught exceptions are captured alongside regular console output.

---

firefox_get_network

Get captured network requests. Shows XHR, fetch, script, image, and other resource requests with status codes and timing. Works on background tabs.

Parameters

Parameter	Type	Required	Default	Description
tabId	number	No	Active tab	Target tab ID. Works on background tabs.
type	string	No	All types	Filter by request type: xmlhttprequest, script, stylesheet, image, font, etc.
status	string	No	All	Filter by status: pending, completed, error
clear	boolean	No	false	Clear requests after returning
limit	number	No	50	Maximum requests to return
includeHeaders	boolean	No	false	Include response headers in output (stripped by default to reduce payload)
timeout	number	No	150000	Request timeout in ms (5000-300000)

Example

// Get all failed network requests
const result = await firefox_get_network({ status: "error" });

// Monitor API calls only
const result = await firefox_get_network({ type: "xmlhttprequest" });

// Get requests with full headers for debugging
const result = await firefox_get_network({
  type: "xmlhttprequest",
  includeHeaders: true,
  limit: 10
});

Notes

• Response headers are stripped by default to reduce payload size. Pass includeHeaders: true when you need them.
• Request bodies are never captured to prevent credential leakage.
• Sensitive URL parameters are redacted in the output.

---

firefox_evaluate

Execute JavaScript in the page context and return the result. Useful for extracting data, checking state, or debugging. Works on background tabs.

Parameters

Parameter	Type	Required	Default	Description
tabId	number	No	Active tab	Target tab ID. Works on background tabs.
expression	string	Yes	-	JavaScript expression to evaluate
timeout	number	No	150000	Request timeout in ms (5000-300000)

Example

// Get the page title
const result = await firefox_evaluate({ expression: "document.title" });

// Read localStorage
const result = await firefox_evaluate({
  expression: "window.localStorage.getItem('user-preferences')"
});

// Check element count
const result = await firefox_evaluate({
  expression: "document.querySelectorAll('.item').length"
});

// Get computed style
const result = await firefox_evaluate({
  expression: "getComputedStyle(document.querySelector('.hero')).fontSize"
});

Notes

• Security restrictions apply. Dangerous patterns are blocked, including fetch(), eval(), and cookie access.
• The expression runs in the page’s own context, so you have access to the page’s DOM, globals, and framework state.
• Return values are serialized to JSON. Complex objects may be truncated.