Browser-laptop: Brave Stopped playing Facebook videos

[egferro]

Test plan

See https://github.com/brave/browser-laptop/pull/14465

Original issue description

Brave version 0.22.727
Windows 10
Today brave stopped playing facebook videos.
When you click play they turn into larger version (almost full screen) but the video never starts.
Please advise

Description

Steps to Reproduce

1.
2.
3.

Actual result:

Expected result:

Reproduces how often:

Brave Version

about:brave info:

Reproducible on current live release:

Additional Information

[eljuno]

+1s from community https://community.brave.com/t/facebook-video-wont-play-with-the-shields-up-mac-os/23568?u=eljuno

Also +1 from me. cc @bsclifton

[Miyayes]

+2 from Reddit community: https://www.reddit.com/r/BATProject/comments/8q4r1n/facebook_blocking_brave/

[LaurenWags]

Reproduces on 0.22.808, adjusting my cookie setting to 'Allow All Cookies' for FB seemed to fix it.

[eljuno]

+1s from Reddit https://www.reddit.com/r/brave_browser/comments/8pzoht/videos_not_playing_on_facebook/

[bsclifton]

If this requires 3rd party cookies, I'm not sure if we want to fix it. cc: @diracdeltas

[Jacalz]

+1 from DM on the community

[srirambv]

+1 from https://community.brave.com/t/videos-dont-play-on-facebook-with-brave/23788

[dgurns]

+1

using Macbook Pro, OS 10.13.3

[eszpee]

Same on OS X

[srirambv]

Updating workaround label. 3rd party cookies don't fix only shields down allows you to play video. More details on #14448

[Slava]

I tested it on Mac and for me switching from "block 3rd party cookies" to "allow all cookies" fixes the problem. Not sure yet what is going on here, for starters the Facebook player makes xhr requests to load pieces of the video and in a normal operation a request looks something like this:

But when the 3rd party cookies are blocked, the response from the server is a 302 redirect which doesn't return anything else

From where I stand now it is not obvious to me we can do anything besides having a work-around of allowing 3rd-party cookies to play Facebook videos.

[Slava]

Weird, testing the same page on Chrome with an extension tracking 3rd party cookies didn't reveal anything special

[Slava]

Seems like a referer problem after all, see https://github.com/brave/browser-laptop/pull/14465

[srirambv]

Verified on Windows 10 x64 using

• 0.23.16 - 2042c45
• Muon - 7.1.1
• libchromiumcontent - 67.0.3396.87

Verified with macOS 10.12.6 using

• 0.23.16 2042c45
• Muon 7.1.1
• libchromiumcontent 67.0.3396.87

Verified on Ubuntu 18.04 x64 using the following build:

• 0.23.17 bc754ebe4dd8d8f59a322660e8af1962a99753ea
• muon: 7.1.2
• libchromiumcontent: 67.0.3396.87

Verified on Ubuntu 17.10 x64

• 0.23.17 - bc754ebe4dd8d8f59a322660e8af1962a99753ea
• Muon - 7.1.2
• libchromiumcontent - 67.0.3396.87