Comment 3 for bug 638722

I had the same problem with thunderbird, did the same (pkg uninstall), fell again in the same trap with firefox.
However, with repeated tries it did work, and I ended up with putting pkg.openindiana.org in /etc/hosts, as mentioned on twitter, bypassing the cache, which may cause the problem
No errors after that.
I suppose the problem comes from the size of files in thunderbird and firefox...