1637106 - Video controls flicker when mouse is moved anywhere on video window

Status: RESOLVED INCOMPLETE

(Core :: Audio/Video: Playback, defect)

Description

[Jeff Bloomfield]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:76.0) Gecko/20100101 Firefox/76.0

Steps to reproduce:

Last 75 version and now 76 branch.

1. Open a video (hbonow, youtube, etc.) and start the video.
2. Move the mouse anywhere on the video.

Model Name: MacBook Pro
Model Identifier: MacBookPro8,2
Processor Name: Intel Core i7
Processor Speed: 2.4 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
OS: 10.13.6 (High Sierra latest update)

Actual results:

The video content is flicker free, but the controls continuous flash while
the mouse is moved.

This effect does not happen on Chrome or Safari. Please fix.

Expected results:

The it was before the bug was introduced: The video window with its controls should remain stable while the mouse is moved over the window. This effect occurs whether or not there are links visible in the content image.

Comment 1

[Marcela (Please NI request to Brindusa Tot)]

Hi Jeff!
I was unable to reproduce this problem on latest Nightly 78.0a1 (2020-05-15) on macOS 10.13.6.
Could you please try to retest this on the latest Nightly Version and tell us what was the result?
You can download from here: https://www.mozilla.org/en-US/firefox/nightly/all/
It would also help some screenshot or video that shows the error and the URL you are using or any other where we can reproduce that error.

Comment 2

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

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 3

[Jared Wein [:jaws] (please needinfo? me)]

HBONow and YouTube both use custom controls and not the standard HTML5 controls. I wonder if there is some interference layers and video playback?

Comment 4

[Jeff Bloomfield]

This may not be a bug after all. When I switched back to Firefox's original profile (the one Firefox creates on first install), the flicking went away.
But before I tried this drastic approach, I did start Firefox up in safe-mode, which did NOT solve the problem.
It had to be something in my profile (which had only been modified through normal browser controls—never directly hacked).
R
estored my bookmarks, reset settings, re-created saved logins, and all seems to be well.

Presently running latest release (76.0.1) with no problems

Comment 5

[Darkspirit]

Please reproduce the flickering, then open about:support, click on "copy text to clipboard" and paste it here. It does not include all changed prefs, but maybe it gives a hint.