JavaScript errors are browser-specific; what works properly for one browser may cause an error in another. With Site24x7 real user monitoring (RUM), you can identify JavaScript errors and view metrics such as browser version, count, device type, and stack trace. Using these details, you can debug errors with ease.

The best way to check if resolved errors get repeated is by inspecting the date and time of the last occurrence. Just select JavaScript Errors in the RUM dashboard to take a look. 

Happy monitoring!