All tabs often crash when closing one tab

Since Tor 7 the thing described in the summary happens very often. About one in five to ten of the times that I close a tab, all the tabs crash and need to be reloaded. I tried version 7 stable and unstable. Clean install, removed the old dir. No addons added.

This didn't happen with version 6. Is v6 still available from official sources?

Trac:
Username: SaturnusDJ