Firefox debugger breakpoint not working

Question

When I click on a line to set a break point, the break point line gets highlighted, then the break point highlight disappears.

Other than that, Firefox developer de

Answer 1

I just encountered the same problem - Firefox Quantum 60 on Ubuntu.

Solution for me was to delete the ~/.mozilla folder for my account. Lost all my bookmarks, history, settings, etc., but can now set breakpoints again.