The problem is Google and Chromium offer no help to FreeBSD and the FreeBSD maintainers don't have suitable hardware, manpower, time (or possibly inside knowledge) to get this right as Chrome/Chromium is a huge beast of a program. Last I heard, a build for Chromium takes 64Gb+ and they don't have such a machine. So they do the best they can.
All you can do is open that tab in a new window and everything will run fine for a while.