Hi Sebastian,

I have attached a simple HTML file that uses Google Maps API v3. Please 
load that up and verify that you get the slow downs as well.

I have tested in the following:

Firefox 21, Firebug 1.11.x to 1.12.a7 - Slow down occurs
Firefox 22beta, Firebug 1.11.x to 1.12.a7 - Slow down still occurs.

Here's something I tried:
I disabled Firebug and enabled Firefox's built-in web tools. The map 
scrolled fine.
Then I used the build-in web tools Inspector, after that there was a small 
floating div around on of the google maps tiles. When I tried to pan the 
map the slowdown came back in pretty much the same way as in Firebug. 
(speed wise)
I ran the Profiler and it looks like 77.8% of processing was stuck in 
MarkupView.jsm:1072 - EE_Update(). Presumably this might have something to 
do with the slow-downs.

It does indeed appear to be a bug related to Firefox. Please verify.

Thanks!





On Thursday, June 6, 2013 8:56:54 AM UTC+2, Sebastian Zartner wrote:
>
> As I wrote in my previous comment it looks like this is actually a bug in 
> Firefox.
> So could you please test it out in Firefox 
> 22<http://www.mozilla.org/firefox/beta/>or above and let us know if that 
> makes any difference?
>
> Sebastian
>
> On Thursday, June 6, 2013 2:09:42 AM UTC+2, Ray West wrote:
>>
>> Hi There, dammit, I couldn't delete the post when I discovered the false 
>> positive.
>> Sorry for any confusion but *the above workaround does not work*. (as 
>> indicated by Luca as well).
>>
>> Something else that might/might not be of interest to the devs though is 
>> that I'm experiencing the slowdown when
>> using jQuery + Google Maps API v3. When Firebug console is enabled, 
>> scrolling maps is jerky and slow. When console is off it's nice and fast.
>>
>> Cheers.
>>
>>
>>
>> On Wednesday, June 5, 2013 12:16:36 PM UTC+2, Ray West wrote:
>>>
>>> Hi there,
>>>
>>> I saw a bunch of people post about slow downs when using Firebug 1.11.x
>>> I had the same problem and this is how I solved it
>>>
>>> I followed a tutorial somewhere to start a new Profile for Firefox.
>>> I created a new profile and tested Firebug, the slow downs disappeared.
>>>
>>> *Workaround / Fix*
>>> It wasn't practical for me to stick with the new/blank Profile so I 
>>> switched back to my default one with the slow-firebug.
>>> I then removed the Firebug addon, restarted Firefox.
>>> Deleted the 'firebug' folder from the my profile directory, restarted 
>>> Firefox.
>>> Browsed to about:config and searched for 'firebug'. Then right-clicked 
>>> each setting and chose 'reset'. When I was done with all the settings I 
>>> restarted Firefox.
>>> After that I reinstalled Firebug 1.12.a7
>>> Now everything is nice and snippy.
>>>
>>> *Conclusion*
>>> I think there are settings in about:config and files in the the profile 
>>> directory that get's left behind when we upgrade firebug.
>>> These settings/files appear to be the cause of the slow-downs.
>>>
>>> I hope this helps someone, it took me a good while to fix. :)
>>>
>>>
>>> On Wednesday, May 29, 2013 1:41:15 PM UTC+2, Sebastian Zartner wrote:
>>>>
>>>> I could reproduce the test case of bug 
>>>> 875797<https://bugzilla.mozilla.org/show_bug.cgi?id=875797>using Firefox 
>>>> 21, though not on 22, 23.0a2 nor on 24.0a1. Tested this on a 
>>>> fresh profile with different versions of Firebug installed.
>>>> So could you all please try to reproduce your problems using Firefox 22 
>>>> and let us know if you still experience the slowdown?
>>>>
>>>> Sebastian
>>>>
>>>> On Wednesday, May 29, 2013 12:56:48 PM UTC+2, Sebastian Zartner wrote:
>>>>>
>>>>> "Me too" comments are not helping to solve the problem. If you have a 
>>>>> test case, please post it together with the steps to reproduce in bug 
>>>>> 876075 <https://bugzilla.mozilla.org/show_bug.cgi?id=876075>.
>>>>>
>>>>> Sebastian
>>>>>
>>>>> On Wednesday, May 29, 2013 12:22:13 PM UTC+2, Egor Lopatin wrote:
>>>>>>
>>>>>> I have the same problem - everything slowing down with opened 
>>>>>> firebug...
>>>>>>
>>>>>

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