Reset the page zoom on pages that cause problems: View > Zoom > Reset (Ctrl+0 (zero); Cmd+0 on Mac)

• http://kb.mozillazine.org/Zoom_text_of_web_pages

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode

Using IE, login to that Xfinity web mail account and open Preferences. On the General tab switch to the Xfinity Connect Lite interface, hit Save' upper-left of that dialog, then log out.

Then try View Entire Inbox in Firefox.

Thanks so much!

When using Preferences to change the email to Xfinity Lite you loose certain valuable features available in the full verfsiion. This may work for some but I enjoy attaching photos in some emails and having them show in he message boz along with a message. It's a shame that two multi-national companys can't get their act straight. Comcast blames Firefox, Firefox blames Concast. In the meantime users are forced to use Internet Explorer. I hate this kind of stupidity. Millions of consumers are inconvenienced. I suspect that Microsoft and Comcast are schemeing in this matter.

That's a strong possibility, Microsoft owns a good amount of Comcast stock.