Firefox 55.0.2 crashes

[cpatti97100]

Hi, as soon as I try to set a different locale, Firefox just crashes.

Firefox 55.0.2 on Ubuntu 14.04.

Thanks for your addon, cheers!

[Pac72]

Same here, on Ubuntu 16.04.3 LTS 64 bit, package firefox 55.0.2+build1-0ubuntu0.16.04.1
I'm available for debugging/testing/whatever (even if it seems more like a firefox bug...)