I am still trying to get Icecat to import passwords/usernames from Firefox. So far this has proved impossible to achieve and no helpful replies from their mailing list so unless or until I can resolved that Icecat is a no-no. Which leaves me for now back at Firefox despite my worries about its future direction.
None of the browsers display correctly on Fedora 23 KDE/Plasma 5 which is a system issue so I guess I'll have to live with that for now until they get KDE sorted which might be a few months yet.
Unless that is someone comes up with another browser I can try
(Linux 64-bit of course).
Stuart