Firefox crashes if the security slider is left at the default on certain pages.
Just letting en.wikipedia.org load with the "Security Level" set to non-high is enough.
Stack trace of thread 3:
#0 0x00000397b4a2d015 n/a (/home/amnesia/sandboxed-tor-browser/tor-browser/Browser/libxul.so)
I did lightly test the default security setting, and haven't seen this before, but my day to day use model follows "Leave the slider on High and forget that it exists", so it's not that surprising.