Não se faz.....

Ó Google, isto faz-se á menina?!?

"Auto F5 reload window" options
Default timeout	*
Timeout for this page	*
Add random value to timeout between 0 and	*
Show and hide menu
Ignore everything after these symbols in URL(separate with spaces)
Include the separators in the URL saved
Hide menu when clicking outside the menu
Prolong timeout on mouseclicks or keyboard input
Reload all pages with default timeout, which has no timeout set
*Format examples: hh:mm:ss, h:m:ss, m:sss, s etc. like 1:20:30 oder 500 oder 3:100