Create AScript that open a tab on Firefox, wait X seconds, close and open other tabs

What's your reason for using Firefox?

Firefox has about the weakest AppleScript support of any browser. What you describe is trivial in Safari or even Chrome, but it's a PITA in Firefox.

If Firefox is needed for some other aspect of your workflow then fair enough, otherwise consider using a different browser for this task.

Here's a simplistic script that meets your given criteria for Safari. It might work for Firefox too since it's very dumb, but if you want to add checking (e.g. make sure that the window you're closing is the same one you opened, and not some other window that you've opened (and are working on!) then Firefox is out:

set theURL to "http://www.apple.com/"

repeat

tell application "Safari"

open locationtheURL

delay 60-- wait one minute

closewindow 1

end tell

end repeat

I guess I'm missing something. What in my above script doesn't meet your needs?

Is it that you want 12 different URLs in order? Nowhere in your original post did you mention that...

set theURLs to {"http://www.apple.com/", "http://www.google.com/", "http://www.facebook.com/"} -- extend as appropriate

repeat with theURL in theURLs

tell application "Safari"

open locationtheURL

delay 60 -- wait one minute

closewindow 1

end tell

end repeat