1861883 - After full-screen mode toggle, the keyboard stops working (<iframe> loses focus)

Status: RESOLVED DUPLICATE of bug 1829594

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[CoolCmd]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/119.0

Steps to reproduce:

This bug first seen in Firefox 119.

1. Change the following Firefox settings:
   Go to about:preferences#privacy and set "Enhanced Tracking Protection" to "Strict". Specifically, the "tracking content" must be ticked.
   *** OR ***
   Go to about:preferences#privacy and set "Enable secure DNS using" to "Max Protection (Cloudflare)". Then go to about:config and set network.dns.disableIPv6=true.

2. Go to https://forums.overclockers.ru/viewtopic.php?p=18069601#p18069601
   and click the video.

3. Press repeatedly F key on the keyboard.

Actual results:

After one or two key presses, the full-screen mode stops switching. Other shortcuts also stop working ("K" for pause/play). This happens because <iframe> with Youtube video loses focus.

Any <iframe> is affected by this bug, not just Youtube, even WebExtension pages loaded from disk!

Expected results:

The full-screen mode should switch.

Comment 1

[CoolCmd]

I'm wondering, how network settings can affect keyboard focus? LOL

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

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

Comment 3

[Edgar Chen [:edgar]]

Sounds like a same bug as bug 1829594 which is fixed on Nightly.
CoolCmd, could you help to try if you still see this on recent Nightly? Thanks!

Comment 4

[CoolCmd]

yes, this is a same bug and it is fixed.

Comment 5

[Edgar Chen [:edgar]]

Thanks!