apple script is easy.
make an applescript to stop and start opera as so:
Code:
try
tell application "Opera"
quit
end tell
delay 2
open application "opera"
end try
so that quits opera, waits 2 seconds for it to quit, and then relaunches it. (load it into Script editor to test it)
To run it every 30min you would want to use cron. The easiest way is to download an application called Cronnix. This is an easy GUI to cron.
Set it to run every 30 min by putting a * in all the fields except minutes (where you would put "0,30") - this will make sense once you download cronnix
