openjdk8 in Firefox?

[Lena at lena.kiev.ua]

May 14 update to openjdk8 and openjdk8-jre
http://svnweb.freebsd.org/ports?view=revision&revision=354182
says "Add support for java/icedtea-web".
Do ordinary users need to use openjdk8-jre instead of openjdk7 in Firefox?
Firefox works with openjdk7, but didn't when I installed openjdk8-jre
and deinstalled openjdk7. I tried to reinstall icedtea-web,
but it began to install openjdk6 which I ^C.