I get this error whenever I have 1000 lines of code open and scroll up and down by mouse wheel (or using the scroll bar) past the 1000 mark. Seems not to happen if I don't have any of my definitions collapsed.
Very frustrating, hangs my whole browser. Makes it really difficult to manage and develop my code.
A script on this page may be busy, or it may have stopped responding. You can stop the script now, open the script in the debugger, or let the script continue.
When I open that in the debugger, the line of code "859" is a huge run on line that takes up pages of text when copied to notepad.
I can click either "stop script" or "continue" and it goes back to working... until I scroll up and down past 1000 lines again.
If I check the box "don't show this message again" , then the next time it crashes my browser
Linux Mint - Firefox - All updates installed.