(in)elegant weapons, for a more civilized age.

webroulette.sh

#!/bin/bash
# WebRoulette by Karim Vergnes <me@thesola.io>
# License: WTFPL 1.0
# Requires xdg-open and a web browser to work.

# Location of the sitefile
: ${LIST:="$HOME/.sitefile"}

# Time interval for sleep
: ${SLEEP_INT:="20-300"}

sleepstep=0

while true
do
    if [[ -f $LIST ]]
    then
        (xdg-open $(shuf $LIST -n 1) &)
    else
        echo "sitefile not found, using uroulette.com fallback..."
        (xdg-open "http://www.uroulette.com/visit/snrtq" &)
    fi
    sleepstep=$(shuf -i $SLEEP_INT -n 1)
    echo "Sleeping for $sleepstep seconds..."
    sleep $sleepstep
done

The format for the ~/.sitefile file is very simple: One URL per line.
webroulette will pick one of the lines at random, and feed it into xdg-open, essentially opening them on your favourite browser.