I recently upgraded from a Rpi2 to a NUC. That was on OpenElec.
Then this past week i've switched from OpenElec to LibreELEC (latest stable version).
I installed Chromium addon. It worked fine, but i noticed that it only starts once. After that, when I try to start it, it won't. I have to reboot in order to use it again.
Also i loose sound once i've used Chromium. It works in Chromium, but when i get out, i don't have the skin sounds anymore. Sometimes starting a movie fixes it, but not always. I have to go into the audio settings to select another setting for output and back to HDMI, then i get my sounds back.