And then again, maybe I just had to wait more :) Here's the crash backtrace

#0  0xffffe410 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb7e1f628 in send () from /lib/tls/i686/cmov/libpthread.so.0
No symbol table info available.
#2  0xb7e4e6c3 in pt_Send (fd=0x9c784e8, buf=0xb40803e8, amount=4096, flags=0,
    timeout=4294967295) at ptio.c:1902
        syserrno = <value optimized out>
        bytes = -1
        fNeedContinue = <value optimized out>
#3  0xb7e4e7df in pt_SocketWrite (fd=0x9c784e8, buf=0xb40803e8, amount=4096)
    at ptio.c:1967
No locals.
#4  0xb7e3508f in PR_Write (fd=0x9c784e8, buf=0xb40803e8, amount=4096)
    at priometh.c:146
No locals.
#5  0xb71a3217 in nsSocketOutputStream::Write (this=0xb4daf98,
    buf=0xb40803e8 "=redacted&\n\n8-JUL 09:06:55 PM  Poll finished, sent request\n\n8-JUL 09:06:57 PM  XMLHTTP RESP (77410) [ attempt 1]: POST\nhttp://mail.google.com/mail/channel/bind?at=1347b14a603d26b4-113a6a2b631&VER=2&SI"...,
    count=4096, countWritten=0xb70b9204) at nsSocketTransport2.cpp:550
        fd = (PRFileDesc *) 0x9c784e8
        n = <value optimized out>
        rv = <value optimized out>
#6  0xb71f0062 in nsHttpConnection::OnReadSegment (this=0xae38800,
    buf=0xb40803e8 "=redacted&\n\n8-JUL 09:06:55 PM  Poll finished, sent request\n\n8-JUL 09:06:57 PM  XMLHTTP RESP (77410) [ attempt 1]: POST\nhttp://mail.google.com/mail/channel/bind?at=1347b14a603d26b4-113a6a2b631&VER=2&SI"...,
    count=4096, countRead=0xb70b9204) at nsHttpConnection.cpp:524
        rv = <value optimized out>
#7  0xb71fa349 in nsHttpTransaction::ReadRequestSegment (stream=0xae8e5530,
    closure=0xae8e4be0,
    buf=0xb40803e8 "=redacted&\n\n8-JUL 09:06:55 PM  Poll finished, sent request\n\n8-JUL 09:06:57 PM  XMLHTTP RESP (77410) [ attempt 1]: POST\nhttp://mail.google.com/mail/channel/bind?at=1347b14a603d26b4-113a6a2b631&VER=2&SI"...,
    offset=0, count=4096, countRead=0xb70b9204) at nsHttpTransaction.cpp:405
        rv = <value optimized out>
#8  0xb7ec2ae8 in nsMultiplexInputStream::ReadSegCb (aIn=0xae8e16d0,
    aClosure=0xb70b91e0,
    aFromRawSegment=0xb40803e8 "=redacted&\n\n8-JUL 09:06:55 PM  Poll finished, sent request\n\n8-JUL 09:06:57 PM  XMLHTTP RESP (77410) [ attempt 1]: POST\nhttp://mail.google.com/mail/channel/bind?at=1347b14a603d26b4-113a6a2b631&VER=2&SI"..., aToOffset=0, aCount=4096, aWriteCount=0xb70b9204)
    at nsMultiplexInputStream.cpp:288
        rv = <value optimized out>
#9  0xb7ec8ed9 in nsStringInputStream::ReadSegments (this=0xae8e16d0,
    writer=0xb7ec2ab0 <nsMultiplexInputStream::ReadSegCb(nsIInputStream*, void*,
 char const*, unsigned int, unsigned int, unsigned int*)>, closure=0xb70b91e0,
    aCount=3070988320, result=0xb70b9204) at nsStringStream.cpp:240
        rv = <value optimized out>
        maxCount = <value optimized out>
#10 0xb7ec3618 in nsMultiplexInputStream::ReadSegments (this=0xae8e5530,
    aWriter=0xb71fa320 <nsHttpTransaction::ReadRequestSegment(nsIInputStream*, void*, char const*, unsigned int, unsigned int, unsigned int*)>,
    aClosure=0xae8e4be0, aCount=4096, _retval=0xb70b9288)
    at nsMultiplexInputStream.cpp:245
        stream = {<nsCOMPtr_base> = {mRawPtr = 0xae8e16d0}, <No data fields>}
        read = 0
        rv = 2928561120
        state = {mThisStream = 0xae8e5530, mOffset = 0,
  mWriter = 0xb71fa320 <nsHttpTransaction::ReadRequestSegment(nsIInputStream*, void*, char const*, unsigned int, unsigned int, unsigned int*)>,
  mClosure = 0xae8e4be0, mDone = 0}
        len = 2
#11 0xb71fc09b in nsHttpTransaction::ReadSegments (this=0xae8e4be0,
    reader=0xae38800, count=4096, countRead=0xb70b9288)
    at nsHttpTransaction.cpp:430
        rv = <value optimized out>
#12 0xb71ef85c in nsHttpConnection::OnSocketWritable (this=0xae38800)
    at nsHttpConnection.cpp:559
        rv = 182683648
        n = 3072259931
#13 0xb71efb49 in nsHttpConnection::OnOutputStreamReady (this=0xae38800,
    out=0xb4daf98) at nsHttpConnection.cpp:770
        rv = <value optimized out>
#14 0xb71a2908 in nsSocketOutputStream::OnSocketReady (this=0xb4daf98,
    condition=0) at nsSocketTransport2.cpp:489
        callback = {<nsCOMPtr_base> = {mRawPtr = 0xae3880c}, <No data fields>}
#15 0xb71a2bca in nsSocketTransport::OnSocketReady (this=0xb4dae98,
    fd=0x9c784e8, outFlags=40) at nsSocketTransport2.cpp:1471
No locals.
#16 0xb71a4ff3 in nsSocketTransportService::Run (this=0x810ac88)
    at nsSocketTransportService2.cpp:591
        desc = (PRPollDesc &) @0x810b180: {fd = 0x9c784e8, in_flags = 6,
  out_flags = 40}
        s = <value optimized out>
        pollInterval = 0
        n = 1
        i = <value optimized out>
        active = 1
#17 0xb7ee71cb in nsThread::Main (arg=0x810b478) at nsThread.cpp:118
No locals.
#18 0xb7e50ead in _pt_root (arg=0x810b4f8) at ptthread.c:220
No locals.
#19 0xb7e1831b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
No symbol table info available.
#20 0xb77e757e in clone () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.