We use Samsung Galaxy Tab 2's and 4's with LTE modems at my office. We have an internal company website users were able to access using Firefox for Android v 19.0.2 for sure. We chose Android due to its proxy support. We recently updated to 35.0.1 and the users no longer receive the prompt for their company credentials, it just goes straight to a page stating "You are not authorized to view this page," which is what they would get if they put in bad credentials normally. I've attached screen shots showing what the user should see and what they're getting now. I have tried Firefox Beta with the same results. Firefox Aurora responds like it should, but that's obviously a ways off from a proper release and honestly, I'm not sure exactly what it is. I'm going to continue testing on older versions to see where it broke, but I don't think I'm able to Push out an older version to install over the newer version to our tablets. Thanks for any help/insight.