@j3s it should be possible to do this without killing Firefox (by using 'detach' instead of 'quit' at the gdb prompt?).

I have a vague memory of recovering lost browser text by doing a sudo grep on /dev/mem once.

(Protip: wrap one letter in the grep regexp with [ ] so the regexp will not match itself, I do that all the time I have do a `ps | grep processname`.)