Chrome MCP JS on Facebook: timeouts, lost state, blocked output

Long scroll-and-extract scripts fail with CDP sendCommand "Runtime.evaluate" timed out after 45000ms, so use short chunks. Helpers set on window are lost on navigation (TypeError: window.__sc is not a function), so re-inject them after each navigate. localStorage used as a cross-query store came back empty, so return results directly from each query. Output containing URLs with query strings is replaced with [BLOCKED: Cookie/query string data], so strip query strings from links before returning them. Large browser_batch runs can also time out; keep batches to a few navigate/wait/extract cycles.