FYI: using Zen Cart 1.5.1

I work with Firefox for admin purposes only.

It works perfectly in Firefox (18.0.1). I only wish it would warn you of the session ending with a popup window. If you are using many tabs in your browser or have many browser windows open, and the admin window is not active, you will miss the warning.

As for IE9.0.12, it warns you with the green screen appearing below the footer section of the admin window. ( picture attached). After 15 minutes, It warns you "Sorry, you have logged out due to inactivity". Once you click continue, you can go back in and continue working in admin, or in another-words the admin session remains active!
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In Chrome, nothing happens the warning doesn't even appear.

I have not tried Opera yet.