What happened?
Tt seems that when you fullscreen a video the corner and tab list clips into it.
Here is a screenshot:


It might not look that clear in the screenshot but you should be able to reproduce it easily by watching a video on youtube in fullscreen. You can see in the left part there is the tab list sticking out, and in the bottom and top part of the right section you can see the corner thing.
Reproducible?
Version
1.0.0-a.10 (64-bit)
Severity impact
Medium
What platform are you seeing the problem on?
Windows
Relevant log output
No response