Steps to reproduce: I use Firefox in landscape orientation on my Android tablet, open YouTube, click on the desktop version of the website, click on a YouTube video, and then click on full screen. Actual results: The video control bar below the video is visible, but cannot be clicked. Trying to reinstall Firefox can still reproduce the problem. Expected results: The video control bar can be clicked. This bug is only triggered when the tablet is in landscape mode. is to access the desktop version of the website. If the video is in portrait mode at first, and then clicked to make the video full screen, the automatic horizontal screen will not trigger this bug. It's all normal on chrome. Some other websites will also appear, such as bilibili.