Closed Bug 1821272 Opened 2 years ago Closed 2 years ago

All videos embedded in web pages fail to play due to denied Cross-Origin request

Categories

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

Product:
Core
Component:
Audio/Video: Playback
Version:
Firefox 110
Type:
defect

Tracking

()

Status:
RESOLVED INVALID

People

(Reporter: striborgvidya, Unassigned)

Details

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/110.0

Steps to reproduce:

Fresh Firefox install on a new pc.
Initially suspected an add-on inherited through Firefox Sync, but the issue presents itself even in safe mode.

Every Twitter video fails to load, and imgur pages containing mp4 files just display a blank page.

Actual results:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://api.twitter.com/1.1/jot/client_event.json?keepalive=false. (Reason: CORS request did not succeed). Status code: (null).

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://t.imgur.com/. (Reason: CORS request did not succeed). Status code: (null).

Expected results:

Videos should have played normally.

See https://support.mozilla.org/en-US/questions/1308176 and https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS/Errors/CORSDidNotSucceed .
Does this also happen when using safe mode in a complete fresh user profile with zero add-ons and zero extensions?

Issue presents itself even in Safe Mode with a fresh profile.

In the fresh profile's case the error message changes to:
Content Security Policy: The page’s settings blocked the loading of a resource at data:i (“object-src”).

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

Component: Untriaged → Audio/Video: Playback
Product: Firefox → Core

Further testing seems to show this applies to any site containing video content.
Youtube mostly unaffected for some reason, though some videos will rarely throw an error.

Summary: All Twitter and imgur videos fail to play due to denied Cross-Origin request → All videos embedded in web pages fail to play due to denied Cross-Origin request

Issue turned out to be caused by the fresh Windows N install lacking the Windows Media Package.
Apologies for this.

Status: UNCONFIRMED → RESOLVED
Closed: 2 years ago
Resolution: --- → INVALID
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