1457526 - Cannot set a breakpoint in DevTools

Status: RESOLVED WORKSFORME

(DevTools :: Debugger, defect)

Description

[rgelbhb]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0
Build ID: 20180323154952

Steps to reproduce:

I tried to set a breakpoint in DevTools.


Actual results:

I try to set a breakpoint in the Debugger tab of the DevTools. I click on the numbers bar on the left. The breakpoint seems to set briefly for a fraction of a second, then it disappears. 

Here is a repro: https://www.youtube.com/watch?v=-5xQjxaaqfY

I think it's been like that since v58


Expected results:

A breakpoint should have been set.

Comment 1

[Cristina Badescu [:cbadescu], Experiments QA]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0
Build ID: 20180501220047

Hello,
 
I have tested this issue on latest Firefox release 59.0.2, latest Nightly build 61.0a1 and could not reproduce it. I have opened an .html file (you can see it here: https://goo.gl/s169KX) and managed to insert breakpoints without encountering any problems, using the Developer Tools -> Debugger tab. 
Could you please provide a minimal test case, in order to debug further the issue?

Also, can you please retest this using a new clean Firefox profile (https://goo.gl/AWo6h8), maybe even safe mode (https://goo.gl/AR5o9d), to eliminate custom settings as a possible cause?
 
 Thanks.

Comment 2

[rgelbhb]

I basically gave up and reinstalled Firefox. It's been working every since. So it must have been a certain combination of settings. Feel free to close this ticket.