Hi skyhorse3593, there are a lot of possible reasons for a blank screen, so please don't assume the worst case scenario just yet. First, is it your home start, the page you display when you start Firefox? There is an issue going around with users who set Yahoo, Gmail, and Outlook mail as their home page loading blank. Clicking the Home button or launching a new window (Command+n) works normally, so it seems to be something specific to startup. Second, can you get to the AT&T Yahoo page if you start from their main page at https://www.yahoo.com/ Or does that not load either? Third, does Firefox display any message about having to allow the site to redirect? That sometimes is associated with a blank page transitioning to a login screen or back to a site from a login screen. ''More generally:'' If a site is generally known to work in Firefox, these are standard suggestions to try when it stops working normally: '''Double-check content blockers:''' Firefox's Content Blocking/Tracking Protection feature, and extensions that counter ads and tracking, may break websites that embed third party content (meaning, from a secondary server). (A) Do you see a shield icon toward the left end of the address bar, near the lock icon? More info on managing the Tracking Protection feature in this article: [[Enhanced Tracking Protection in Firefox for desktop]] (before Firefox 70: [[Content Blocking]]). (B) Extensions such as Adblock Plus, Blur, Disconnect, DuckDuckGo Privacy Essentials, Ghostery, NoScript, Privacy Badger, uBlock Origin or uMatrix should provide toolbar buttons to manage blocked content in a page. There may or may not be a number on the icon indicating the number of blocked items; you may need to click the button to see what's going on and test whether you need to make an exception for this site. '''Cache and Cookies:''' When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site. (1) Clear Firefox's Cache See: [[How to clear the Firefox cache]] If you have a large hard drive, this might take a few minutes. (2) Remove the site's cookies (save any pending work first). While viewing a page on the site, click the lock icon at the left end of the address bar. After a moment, a "Clear Cookies and Site Data" button should appear at the bottom. Go ahead and click that. In the dialog that opens, you will see one or more matches to the current address so you can remove the site's cookies individually without affecting other sites. Then try reloading the page. Does that help? '''Testing in Firefox's Safe Mode:''' In its Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, and some other advanced features to help you assess whether these are causing the problem. ''If Firefox is not running:'' Hold down the option/alt key when starting Firefox. (On Windows, hold down the Shift key instead of the option/alt key.) ''If Firefox is running:'' You can restart Firefox in Safe Mode using either: * "3-bar" menu button > "?" Help > Restart with Add-ons Disabled * (menu bar) Help menu > Restart with Add-ons Disabled and OK the restart. ''Both scenarios:'' A small dialog should appear. Click "Start in Safe Mode" (''not'' Refresh). Any improvement?