The Stylo engine seems to need some mechanics repair before enter the starting line at Fedora. https://bugzilla.mozilla.org/show_bug.cgi?id=1341234 is breaking us.
Seems to be a general problem with Firefox 56 - let's try 57 builds then.
Fixed by Firefox 57 beta 5.
I was wrong here, it was caused by our patches. Fixed by firefox-56.0-5, update is on the way.
firefox-56.0-5.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2017-5afb5b3327
firefox-56.0-5.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2017-1db64016e9
firefox-56.0-5.fc25 has been submitted as an update to Fedora 25. https://bodhi.fedoraproject.org/updates/FEDORA-2017-0f7fefa567
firefox-56.0-5.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-1db64016e9
firefox-56.0-5.fc25 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-0f7fefa567
firefox-56.0-5.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-5afb5b3327
firefox-56.0-5.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.
firefox-56.0-5.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.
firefox-56.0-5.fc25 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report.