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

I've noticed it while checking recently created thread:

• `no-large-media` click-to-load never working for video/audio on Firefox #3717

It occurs on the latter URL only.

It's another issue falling into category of "resource drain" issues, after previous issue wherein an internet drain was occurring:

• no-large-media can cause a large volume of repeated requests for audio file #3184

This time there is no Internet drain, instead there is CPU & RAM drain.
This time there is no uBO logger flood, instead there is browser dev console flood.
So it seems like a technically different issue than previous, but still "resources drain" category.
I didn't investigate deeper, hence I don't know whether it's a website or a browser or uBO responsible, or a mix of them.

A specific URL where the issue occurs.

https://en.wikipedia.org/wiki/Video

Steps to Reproduce

1. have no-large-media enabled
2. visit the latter URL
3. open dev console (F12)
4. click "play" video
5. click "play" video again
6. observe dev console + windows task manager CPU & RAM usage

Expected behavior

The issue to don't occur.

Actual behavior

7. notice that:
   • dev console is being kept flooded by some warnings & errors stucked in an infinite loop
   • in windows task manager:
     • two single CPU cores are occupied by browser processes with 100% each
       ( I guess one is a browser process and the other is a console process)
   • for the both processes, RAM usage appears rapidly, collectively turning into a several GB memory leak festival in a matter of a minute

With dev console hidden, the issue is smaller: 1 CPU core utilized at 50% + 300-400 MB RAM.

uBO version

1.65.0

Browser name and version

Firefox 139.0.4

Operating System and version

Win 7 x64 SP1 Pro