refresh my memory -- why firefox goes grey and inactive?

[Jonesy]

On Sat, 26 Jun 2010 16:09:02 +0200, Markus Schönhaber wrote:
> 26.06.2010 15:39, Bill Liao:
>
>> On Sat, Jun 26, 2010 at 9:11 PM, Hal Burgiss <hal at burgiss.net> wrote:
>
>>> I believe the setting to turn off the 'greyed out' visual queue stuff
>>> is buried in Compiz somewhere.
>>>
>> 
>> He says it's unreponsive ,i think it's not the visual result of Compiz.
>
> No, it's indeed not compiz causing this, it's just the other way round:
> because FF has become unresponsive, compiz applies this visual effect to
> the FF window.
> And: turning off this visual effect doesn't make FF more responsive.
> Therefore, 'greyed out' or not, the only important question is why FF
> hangs in the first place.

Could it be the "IPv6 versus IPv4 thingy" -- still?