Error in Web-Console ReferenceError: jQuery is not defined

[nanocosm]

Since update to 8.1 I always get an "ReferenceError: jQuery is not defined" when accessing the Web-Console of a PVE.
This happens only with Firefox. No AdBlocker, no Enhanced Tracking Protection. Cache already cleared, even tried with a fresh profile.
After confirming (clicking) the web-console works just fine.

Any idea how to deal with it? (Except answers like "Use Chrome" which is not an option)

 

[TauriRed]

I also have this issue but only in Chrome.
Chrome does have it.
Chrome incognito doesn't.
Firefox and Safari doesn't.
Looks like some extension do cause conflict. It's not ublock (my pve domain is on whitelist and I tried disabling it without success),it's also not tampermonkey(disabling doesn't help).
What's also interesting is that https://semaphore.social/ (web mastodon client) also shows same behavior except that message is in console. jquery error in Chrome but not in Firefox.