What this addon does is to let Firefox ask IE to open a page for it.
You the user will not see IE. It works in the background to open
the page and passes the content to Firefox to display it.

First, go here to find and download the IE Tab addon for your version of Firefox.
(Open Firefox, click "help" and select "about Firefox" to find what version you have.)
Click on the big green "download now" button and click "save file."
Note where it gets saved (or select to save it somewhere you can find it) so you can open it in the next step.
Double-click the file you just saved and follow the prompts to do a basic install.
Now open Firefox.
On the "tools" drop down menu there should be a new item called "IE tab options." Click that.

In the window that opens, click the "sites filter" tab.
Near the bottom of that window is a white box labeled "URL" on the left and a button called "add" on the right.
Type into that box    http://www.tcoek12.org/webmail    and click the ADD.

Then type into that box    http://www.tcoek12.org/web/*    and click the ADD.


Click "OK"

You should now be able to use Firefox to check TCOE Webmail.