Prerequisites

• I verified that this is not a filter list issue. Report any issues with filter lists or broken website functionality in the uAssets issue tracker.
• This is NOT a YouTube, Facebook or Twitch report. These sites MUST be reported by clicking their respective links.
• This is not a support issue or a question. For support, questions, or help, visit /r/uBlockOrigin.
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue.
• The issue is not present after disabling uBO in the browser.
• I checked the documentation to understand that the issue I am reporting is not normal behavior.

I tried to reproduce the issue when...

• uBO is the only extension.
• uBO uses default lists and settings.
• using a new, unmodified browser profile.

Description

When no-large-media is enabled and a large audio file is opened (as the top level document), Firefox makes repeated attempts to stream the audio, downloading hundreds of megabytes of data very quickly.

A specific URL where the issue occurs.

https://static.wikia.nocookie.net/undertale/images/e/ee/MEGALOVANIA_music.ogg/revision/latest?cb=20160401053451

Steps to Reproduce

1. In uBlock Origin settings, enable blocking of large media elements
2. Open a large audio file in a new tab (for example this one)
3. Open the uBlock Origin request log or the network tab in browser console and observe an excessive amount of requests

Expected behavior

Either the audio file should be blocked in such a way that the browser doesn't attempt to download it again, or alternatively the file should play without interference from uBlock Origin

Actual behavior

The browser makes a large number of requests, downloading hundreds of megabytes in a short time.

uBO version

1.56.0

Browser name and version

Firefox 124.0

Operating System and version

Manjaro Linux