How to make Xvfb display visible?

Question

I am running selenium through Xvfb on display number :99 like this:

/usr/bin/Xvfb :99 -ac -screen 0 1024x768x8 & export DISPLAY=\":99\" &&

Answer 1

A simple solution is also to constantly take screenshots of the program like this:

while /bin/true; do
    DISPLAY=:99 import -window root ~/Pictures/xvfb_screenshot.png
    sleep 0.1
done &
PID=$!
feh --reload 0.1 ~/Pictures/xvfb_screenshot.png 2>/dev/null
kill $PID

Note: requires to install imagemagick and feh