udev + logind + uaccess can grant users access to /dev devices while they are logged in by adding user ACL to devices when they are logged in.
udev tags devices with
uaccesstag. logind sees uaccess tag and gives logged-in users access to the tagged /dev devices.
This can be convenient and perhaps securer because users don't have to add themselves to supplementary groups.
Have you reproduced the issue on chromium-based browsers?
Brave 1.15.69. It's fine on tor browser which is based on firefox.
If the page has focus, space key pauses or resumes the video.
If the video has focus, space key event is triggered for both the page and the video. Thus, space key is pressed twice when the video has focus.