hello? I am currently using Firefox Nightly(Snap 119.0a1) on Ubuntu 23.04. As the title suggests, when the main Firefox window on YouTube goes into the background, the subtitles in the PIP are not updated. 1. Go to YouTube in Firefox nightly, play a video, turn on subtitles and PIP. 2. Open a program other than QT and change it to full screen. 2-1. I just tested it, and it can be reproduced by simply minimizing Firefox. 3. Subtitles are not updated until the main Firefox window (not the PIP window) appears on the screen. 3-1. When I opened the QT program in full screen it worked fine (Firefox may not be aware that the QT program has obscured Firefox). 4. When the Firefox main window appears on the screen using any method such as Alt+Tab or Win key, the PIP subtitles are updated again. 4-1. Even if it is a GTK app, transparency is applied and the subtitles are updated when the Firefox main window is visible in the background. ※ I created a new profile for testing and tested it, and the same problem occurred. This is a description of the attached photos (1,2,3 in order from left/video capture time is the same video time) 1. Subtitles and video displayed normally in the Firefox window 2. The state in which the Firefox window is displayed on the screen: The subtitles in the PIP window are updated. 3. The Firefox window is hidden or minimized: The subtitles in the PIP window are not updated (the subtitles before minimizing the window are not updated to the next subtitles). English may be weird because I used Google Translator!