Hardened Tor Browser crashes when I visit http://physioflex.ch/.

Steps to reproduce:

1. open Hardened Tor Browser 6.5a1
2. set security slider to "Medium-Low"
3. open http://physioflex.ch/
4. wait for the crash (no need to do anything)

Error message:

==537696==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7f7e818fa240 at pc 0x7f7ea152ae7a bp 0x7f7e818fa180 sp 0x7f7e818fa178 READ of size 4 at 0x7f7e818fa240 thread T28 (Compositor) ASAN:SIGSEGV ==537696==AddressSanitizer: while reporting a bug found another one. Ignoring. Jun 27 18:18:45.000 [notice] Owning controller connection has closed -- exiting now. Jun 27 18:18:45.000 [notice] Catching signal TERM, exiting cleanly.

Trac:
Username: pege