Firefox users I need a little help
 

I use an online email program to send mail out. When im going to compose a new mail a popup window comes up to send the mail out.

My problem is with this popup window in firefox. I cant adjust it. Its stuck in this window size. I added a few extensions and this problem just started.

Does anyone know of an extension or setting to change this?

use internet explorer for that! I swap between the two!