Firefox red flash when no search is found

Question

I see a very big and annoying red flash in the whole browser when I search and nothing is found. Is totally unexpected, and I don't understand why happens in an older browser too.

This is the third time that I try to post this question. I decided to record my screen to show the problem.

The video shows the same problem in both Firefox browsers, in different computers.

Modern Firefox version (this): 103.0 (64-bit).

VPS older version: 78.15.0esr (64-bit), never changed a setting.

Same thing.

Anyone knows why is happening this?

Tried private mode (see video), no plugins.

Tried stupid things like change wayland/xorg.

Tried default and other themes.

I could understand that my regular Firefox behaves different, what I can't really understand is why a vanilla Firefox in Debian does the same thing.

And yes, it's totally unexpected and eye hurting.

Tried a new profile, no changes. Tried clean startup (no plugins), no changes.

Answer 1

It's not a feature of Firefox. It looks more like a feature of your Desktop Environment that enhances Firefox's alert sound and small red flash in the search box. Check if you have any accessibility settings enabled in DE's settings.