Opera beta (latest version) in a Docker container.
download and compile the source yourself from Github:
$ git clone https://github.com/megastallman/docker-opera.git
$ cd docker-opera
$ docker build -t megastallman/docker-opera .
$ docker run --rm -v /tmp/.X11-unix:/tmp/.X11-unix -v /var/run:/var/run -v /tmp:/tmp -e DISPLAY=unix$DISPLAY megastallman/docker-opera
This project can be used as a backbone to containerize any other proprietary shitware.