All -

For several months now, I've noticed that periodically, "Break on all 
errors" in the Console pane doesn't do anything for me. I press the button, 
then encounter an error in my code, and the error is printed to the 
console, but I don't get a breakpoint. This used to work reliably, and now 
works only occasionally (and I can't figure out the circumstances under 
which it does and doesn't work). Here's what did to try to figure this out 
so far:

- I removed Firebug
- I deleted every single config option in about:config that contains 
"firebug" in its name, restarted Firebug, and made sure they were gone
- I searched my Firefox profile for every single reference to Firebug in 
the various config files and removed anything suspicious by hand
- I reinstalled Firebug
- I went to about:config and checked to ensure that all the config options 
are set to their defaults. Possibly notable: the config option 
extensions.firebug.breakOnErrors is default and false; there are no config 
options that start extensions.firebug.DBG_BREAK...
- I went to a window that I know generates a Javascript error, and opened 
Firebug
- I returned to about:config, and observed that the config option 
extensions.firebug.DBG_BREAKONERROR is now present, and marked "user set" 
and "false"
- I enabled the Console and Script panels in Firebug
- I checked about:config again; neither of the options noted above has 
changed
- I enabled "Break on all errors" in the Console panel. Neither of the 
config options changes.
- I forced a Javascript error in my window; the error is printed to the 
console but no breakpoint is hit.
- I toggle both the config options by hand, repeat the procedure, get a new 
error in the console but no breakpoint.
- I return both configs to their default. DBG_BREAKONERROR disappears on 
reload of about:config. I return to my errorful window, enable "Break on 
all errors" again, same behavior.

Something's happening that I can't find, because after the error is 
printed, the "break on all errors" button turns itself off.

I'm on MacOS 10.10, if it makes a difference.

Help!

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