Description of problem: gcc 8 should have performance improvements with pgo/lto enabled. Let's investigate that and enable it for Fedora builds.
firefox-64.0-7.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2019-ff4b403dc7
firefox-64.0-7.fc29 has been submitted as an update to Fedora 29. https://bodhi.fedoraproject.org/updates/FEDORA-2019-ba803bec25
firefox-64.0-7.fc28 has been pushed to the Fedora 28 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-2019-ff4b403dc7
firefox-64.0-7.fc29 has been pushed to the Fedora 29 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-2019-ba803bec25
firefox-64.0-7.fc29 has been pushed to the Fedora 29 stable repository. If problems still persist, please make note of it in this bug report.
firefox-64.0.2-1.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2019-87d7d9ad56
firefox-64.0.2-1.fc28 has been pushed to the Fedora 28 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-2019-87d7d9ad56
firefox-64.0.2-1.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.