Here’s the corresponding bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=1282419
Tested 55 and nightly, no crash.
Can you please test official mozilla binaries and send the crash report id?
Fedora 26 (firefox-55.0.3-1.fc26.x86_64) crashes.
Can’t reproduce the crash here either, on Firefox 55.0.2, Ubuntu 16.04
Tested on the latest nightly from the PPA (57.0a1 build 20170910114517) and it crashes, too. It also doesn’t recognize the crash, so there is no way to send a crash report. Also the health dashboard shows 0 crashes.
AIUI crash reporting is simply not enabled for anything that’s not an official build straight from Mozilla. EDIT: I’m not sure whether that’s the case for these PPA packages.