After updating firefox in Ubuntu 12.04.5 LTS, yesterday, firefox no longer starts: That is, I can ask
$ firefox --version
Mozilla Firefox 39.0.3
but if I call it without arguments, it exits (after many syscalls according to strace) which is rather large:
$ rm -fr .mozilla
$ strace firefox 2> firefox.strace
$ wc firefox.strace
11481 95492 958346 firefox.strace
I also moved .mozilla
away, but to no avail.
As suggested by @clearkimura, here is the result of running the profile manager:
How can I get it working again?