Hey, thanks for the report. This is a known issue, there are already a few threads about it.
Main thread: Bug: Browser tab unresponsive after moving to new window (v2.4.22)
Current workaround:
- Don’t move the Browser tab into a separate window, keep it in the main Cursor window
- Or open
localhostdirectly in a regular browser
If there are updates, they’ll show up in the main thread. I’m closing this thread as a duplicate.