I use Firefox for personal browsing and Chrome for business browsing, simply because I can keep two gmails open when using two browsers. Nice to know CT is partway there for Chrome...
Back to Firefox:
Any of the old versions of non-ESR Firefox will auto-update to 57 when closed & re-opened, that must be why we need to use ESR.
Even Mozilla agrees we need a workaround for Firefox 57:
https://support.mozilla.org/en-US/kb/switch-to-firefox-extended-support-release-esr
On the ESR download page
https://www.mozilla.org/en-US/firefox/organizations/all/
we are at the mercy of our OS and language. English for Mac downloads as 52.5.0
I am absolutely Jubilant to report that CT 31.2.3 works wonderfully on Firefox ESR 52.5.0 !!!!!!!!!!
I will continue to subscribe to this post in order to congratulate you when the issue with Firefox 57 is fixed.