713211 - Javascript error using Firebug

Status: RESOLVED INVALID

(Core :: JavaScript Engine, defect)

Description

[Paul Silaghi, QA [:pauly]]

Build identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0) Gecko/20100101 Firefox/10.0

Reproducible: always

Steps to reproduce:
1. Launch Firefox
2. Install latest Firebug: http://getfirebug.com/releases/firebug/1.9/firebug-1.9.0b4.xpi
3. Open www.google.com
4. Press F12 to display the Firebug console
5. Go to Console and Script panels and enable them
6. Stay on the Script panel
7. Ctrl-R to reload
8. Click on lines 1 and 2 to set breakpoints.
9. Ctrl-R to reload
10. Click again on lines 1 and 2 to remove the breakpoints
11. Ctrl-R to reload

Actual results:
"No Javascript on this page" is displayed and the Console panel says:
google is not defined
[a,b];return false}};(function(){var a=google.j;window.onpopstate=

Expected results:
No errors should occur.

Comment 1

[David Mandelin [:dmandelin]]

Could you get us a regression range for this?

Comment 2

[Paul Silaghi, QA [:pauly]]

The issue is reproducible on all Firefox versions (v4-v10). 
On Firefox 4 I used http://getfirebug.com/releases/firebug/1.7/firebug-1.7.0.xpi for testing since Firebug 1.9 is compatible only with Firefox 5 or higher.

Comment 3

[David Mandelin [:dmandelin]]

OK, I see the problem too. It looks like users can work around by pressing Ctrl+R again.

I notice that on step 9, the code is actually paused at one of the breakpoints, and if I continue and make sure the code isn't paused, then it works correctly. So it looks like there is some glitch, possibly a race, where the code isn't seen if paused at a breakpoint. I think it may be a Firebug bug rather than a JS engine bug, although I'm not sure.

Comment 4

[André Bargull [:anba]]

Firebug is EOL, therefore resolving as Invalid.