I've tried using the email timer and it seems to pause when running in the background. I tried setting the timer to 600 seconds, and setting a timer on my phone to 3 minutes at the exact same time. Then I opened some random video in VLC player and full screened it. When the timer on my phone rang I checked the mail timer and it was at 505. Only a minute and a half less than it started at.

I also tried changing focus to a video without full screening it. And again the timer had only gone down about 90 seconds after considerably more time had actually passed.

I also tried to set the timer to 150 and waiting longer than that. The email did not get sent and the timer read 75 seconds when I switched back to it. So it's not just the display that's wrong. It seems like the count really isn't progressing.

That's not how browsers should work, but anyway we'll make a patch for that