A reproducable hang for me (with adblock plus installed) is to visit
pingtest.net
This happens even if adblock is turned off (via it's menu - the add-on still
enabled).
Disabling the add-on stops firefox hanging.
$ apt-cache policy adblock-plus
adblock-plus:
Installed: (none)
Candidate: 1.1.1-0ubuntu3
Version table:
1.1.1-0ubuntu3 0
500 http://nz.archive.ubuntu.com karmic/universe Packages
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adblock plus hangs firefox visiting some pages containing java applets
https://bugs.launchpad.net/bugs/300416
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