Found in

• 114.0b7

Affected versions

• 114.0b7, 115.0a1 (2023-05-23)

Tested platforms

• Affected platforms:  Win 10, Ubuntu 22.04, MacOS 13

Steps to reproduce
1. Launch Fx.
2. Go to https://www.euronews.com/2020/05/20/coronavirus-capt-tom-moore-to-be-knighted-after-raising-33m-37m-for-health-workers
3. Wait till PIP button appears in the URL bar (< 2 sec).
4. Play the video.
5. Wait till the ad ends (or skip it) and the main video starts playing.

Expected result

• PIP button is still present in the URL bar.

Actual result

• PIP button disappears from the URL bar when the main video starts playing.