Apple - Automatically scan/cycle through safari tabs?
You can use this block of AppleScript to loop through your tabs on a window:
tell application "Safari"
repeat
repeat with i from (count of tabs of window 1) to 1 by -1
set thisTab to tab i of window 1
set current tab of window 1 to thisTab
delay 1
end repeat
end repeat
end tell
This will go through all your tabs and switch every 1 second. Just change the delay to change the time before each tab switches.