DavidLIR,
This is just general info - Abantecart uses caching to increase the speed of page delivery and browsers also cache. So often when you make changes into your pages - you won't see those activate until you actually clear the cache, often in both places.
Under System > Cache at the bottom of the page you can clear the cache on the server.
You should also clear the cache on your PC. Sometimes if a glitch has been fixed, you can continue to see the bug because you are viewing a cached version of the page, so force refreshing will allow you to see the fix.
Generally speaking, CTRL-F5 will do a non-cached refresh, while F5, CTRL-R, and Refresh button will do a cached refresh. That is, the browser will not retrieve the latest information from the server, unless you perform a CTRL-F5
Lee
PS Abantecart will need to answer about the extensions - for more clarity that I can provide.