[Bug 113201] Re: firefox spends lots of time hung

[Sergey Fukanchik]

This bug affects me too. It usually appears on slow connections like
GPRS or on connections which have some problems with DNS. Also
it appears almost on all connections if i install dnsmasq. But i never
seen it on Ethernet connections.

When firefox hangs it consumes 100% of CPU.

This bug appears when i open new tab, close old, or just switching tabs.
Usually clicking on the links doesn't affect it.

Running firefox -g and beraking during the hang reveals nothing.
It usually breaks in different places but often i see js_Invoke.

It is very annoying per se, but the worst thing about it is the short-living
X Server windows which firefox uses alot. Say if i open new tab and
quickly click on menu "File" firefox opens system-modal menu window
and hangs and the entire X server becomes unusable (does not respond to my actions)
until firefox resumes. I can't switch to another application, the panels do not
respond to my clicks and so on.

The duration of the hang depends on number of open tabs. If i open 50 tabs
it will be about 90 seconds. When i have 10 open tabs it's about 15 seconds.

-- 
firefox spends lots of time hung
https://bugs.launchpad.net/bugs/113201
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