The newest version of Firefox is having a small error when it comes to displaying some of the sub-tabs in Blackboard (such as the 24/7 trainer tab), but no need to worry! We have a simple fix if you are using the newest versions of Firefox.
When you see a tab that doesn't seem to have any information on it, it's because Firefox is actually blocking it.
Once you arrive at a tab that is blocked, you will see a shield in the left side of the URL bar. You will want to click the "Keep Blocking" drop down chevron and click, "Disable Protection on This Page."
Once you have done this, the tab will show up as normal.
Below is an image that shows exactly what you should see!