As pointed out by someone else, and just rediscovered by me, Mozilla
does not work with recent kernels -- almost certainly due to changes
in the IPv6 stack.

Remember that Mozilla uses v4 encapsulated addresses when using the v6
stack.  Every connect() results in:

   382 mozilla-bin CALL  connect(0x1e,0x50025998,0x1c)
   382 mozilla-bin RET   connect -1 errno 22 Invalid argument

Mozilla then oh-so-helpfully pops up a dialog box that says:

The connection was refused when attempting to contact www.google.com.

which is of course completely bogus.

Could you perhaps look into this?