Windows 10 bereikte EO (einde ondersteuning) op 14 oktober 2025. Als je Windows 10 gebruikt, lees dan dit artikel.

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developer tool add breakpoint stops working if page is refreshed while dev tools are open

Firefox Anders
Ali A. beantwoord
Ali A.
Ali A.

Hi, I have this problem, in dev tools debugger, the I am unable to add a breakpoint to javascript code . through trial and error I have found if I refresh the page while devtools are open and after page loading I try to add breakpoint to any javascript file or in page javascript. it does not work. break point is "not" added neither by clicking on edge nor by the right click menu.

but if i close the dev tools and then refresh page and then open dev tools and add break point same as above. It works and breakpoint is added.

I have tried it in safe mode too. its the same.

Hi, I have this problem, in dev tools debugger, the I am unable to add a breakpoint to javascript code . through trial and error I have found if I refresh the page while devtools are open and after page loading I try to add breakpoint to any javascript file or in page javascript. it does not work. break point is "not" added neither by clicking on edge nor by the right click menu. but if i close the dev tools and then refresh page and then open dev tools and add break point same as above. It works and breakpoint is added. I have tried it in safe mode too. its the same.

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jscher2000 - Support Volunteer
jscher2000 - Support Volunteer

Hi Ali, there is a similar thread going on the DevTools forum, but I think your description is more specific:

https://discourse.mozilla.org/t/cant-set-debugger-breakpoints/33972

I can't tell whether this particular issue has been logged in Bugzilla, the bug tracking system, because there are a large volume of recent results when I search for debugger breakpoint in open bugs:

https://bugzilla.mozilla.org/buglist.cgi?quicksearch=debugger+breakpoint

Do you want to follow up on Discourse or file a new bug?

Ali A.
Ali A. Vraageigenaar

jscher2000 said

Hi Ali, there is a similar thread going on the DevTools forum, but I think your description is more specific: https://discourse.mozilla.org/t/cant-set-debugger-breakpoints/33972 I can't tell whether this particular issue has been logged in Bugzilla, the bug tracking system, because there are a large volume of recent results when I search for debugger breakpoint in open bugs: https://bugzilla.mozilla.org/buglist.cgi?quicksearch=debugger+breakpoint Do you want to follow up on Discourse or file a new bug?

Thank you .


I have added my find / workaround fix to the following bug : https://bugzilla.mozilla.org/show_bug.cgi?id=1558771

also added to the discord

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