Comment 115 for bug 236853

Please see https://bugzilla.mozilla.org/show_bug.cgi?id=427715#c105
it was fixed for 3.5
This should have been fixed in 3.0 see:
firefox-3.0 (3.0.14+build2+nobinonly-0ubuntu0.8.04.1) hardy-security; urgency=low

  * security/stability v3.0.14 build2 (FIREFOX_3_0_14_RELEASE)
    - see USN-821-1
    - fix LP: #236853 - firefox crashed with SIGSEGV in NSSRWLock_LockRead_Util()

 -- Alexander Sack <email address hidden> Mon, 07 Sep 2009 14:27:50 +0200

hardy and up has been fixed. please make sure you are at latest version and try using a new profile following the instructions on the following link:
https://wiki.ubuntu.com/MozillaTeam/Bugs#Try%20with%20a%20new%20profile