2010274 - soundcloud.com - The audio wave illustration is not rendered correctly with Standard ETP in Private Browsing Mode

Status: NEW

(Web Compatibility :: Privacy: Site Reports, defect)

Description

[Bernadett Farkas]

Environment:
Operating system: Mac OS X 10.15 / Windows 10
Firefox version: Firefox Nightly 149.0a1 (2026-01-14)

Preconditions:

• Valid user credentials
• ETP set to Standard in Private Browsing Mode

Steps to reproduce:

1. Access: https://soundcloud.com/feed
2. Log in with valid user credentials
3. Play different audio files
4. Observe the page

Expected Behavior:
The audio wave illustration is correctly rendered

Actual Behavior:
The audio wave illustration is not rendered correctly (randomly)

Notes:

• Reproduces in ~6 out of 10 audio files
• Reproduces in ETP Strict (Normal mode) and ETP Standard (Private Browsing mode)
• Reproduces in firefox-nightly, and firefox-release
• Does not reproduce in chrome

Created from https://github.com/webcompat/web-bugs/issues/200355

Comment 1

[Bernadett Farkas]

Attachment: Audio wave issue Nightly vs Chrome

Comment 2

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

Since nightly and release are affected, beta will likely be affected too.
For more information, please visit BugBot documentation.

Comment 3

[Nawid]

Attachment: soundcloud bug.png

Firefox 147.0, GPU: AMD Radeon RX 9070 XT

The audio itself is fine, but the SoundCloud waveform visualization is frequently corrupted (see image).
This occurred occasionally in the past but became much more frequent after recent AMD GPU driver updates.
The issue appears to be limited to the visual rendering of the waveform only; audio playback is unaffected.
When multiple waveforms are displayed, the corruption usually affects only a single waveform—most often the first one—while the others render correctly.

Comment 4

[Nawid]

Attachment: black render soundcloud.png