User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:103.0) Gecko/20100101 Firefox/103.0

Steps to reproduce:

Device: macOS Mojave 10.14.6
Firefox build: 103.0.2

1. Open Firefox
2. Go to youtube.com and play any videos with subtitles.
3. Turn on Subtitles/Closed Caption.
4. Activate Firefox PiP (Picture-in-Picture) mode.
5. Press Command+M to minimize the window
6. Notice how the subtitles are not updated as the video continues to play.

Actual results:

Device: macOS Mojave 10.14.6
Firefox build: 103.0.2

Subtitles in PiP mode freeze when the window is minimized (by pressing Command+M).

Expected results:

Device: macOS Mojave 10.14.6
Firefox build: 103.0.2

Subtitles in PiP mode should not be frozen when the window is minimized.

The Bugbug bot thinks this bug should belong to the 'Toolkit::Picture-in-Picture' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Bug 1770429 partially fixes the observed behaviour (see comment 14). Reopening this ticket for MacOS.

I've moved the dependency and severity from the partially fixed bug. Please remove if incorrect.

Using MacOS 12.5.1, I tested 10 different sites varying from WebVTT supported ones to site-specific wrapper supported ones. For 7 of 10 videos, captions update as expected with a minimized MacOS video. The 3 sites without updated captions were from the following sites:

1. youtube.com (example)
2. khan academy (example)
3. duckduckgo embedded videos (example)

All these videos have one thing in common: they use our YouTube wrapper. It appears that the captions container for youtube doesn't ever update when the window is minimized. This is despite AppWindow.browsingContext.forceAppWindowActive and AppWindow.browsingContext.isActive being set to true.

Will need to look more into how we can work around this constraint.

Hi Daniel, Bug 1768495 was recently fixed. With the latest version of Nightly (112.0a1), I now see subs update when the originating window is minimized for MacOS. Can you please verify if this has been fixed from your end?

Yes, the issue appears NOT to reproduce anymore in the latest Nightly v112.0a1 in MacOS 11 and MacOS 12.

Thanks Daniel. I'll go ahead and marked this as fixed.

I also just realized that I linked the wrong bug. The bug that fixes this issue is Bug 1768495.

I can confirm this fix in Nightl v113.0a1 and Beta v112.0b5. Thank you.