First check if Cursor can connect to its services.

Run network diagnostics: Go to Cursor Settings > Network and click Run Diagnostics. This tests your connection to Cursor’s servers and identifies network issues affecting AI features, updates, or other online functionality.

If diagnostics reveal connectivity issues, check firewall settings, proxy configuration, or network restrictions blocking Cursor’s access.

For extension issues:

Disable all extensions temporarily: Run cursor --disable-extensions from the command line. If issues resolve, re-enable extensions one by one to identify the problematic one.

Reset extension data: Uninstall and reinstall problematic extensions to reset their stored data. Check settings for extension configuration that persists after reinstallation.

Cursor stores app data outside the app for restoration between updates and reinstallations.

To clear app data:

Windows: Run these commands in Command Prompt:

rd /s /q %USERPROFILE%\AppData\Local\Programs\cursor*
rd /s /q %USERPROFILE%\AppData\Local\Cursor*
rd /s /q %USERPROFILE%\AppData\Roaming\Cursor*
rd /s /q %USERPROFILE%\cursor*

MacOS: Run sudo rm -rf ~/Library/Application\ Support/Cursor and rm -f ~/.cursor.json in Terminal.

Linux: Run rm -rf ~/.cursor ~/.config/Cursor/ in Terminal.

To uninstall Cursor:

Reinstall from the Downloads page. Without cleared app data, Cursor restores to its previous state. Otherwise, you get a fresh install.