Prerequisites

• I verified that this is not a filter list issue. Report any issues with filter lists or broken website functionality by using the chat icon in the popup panel.
• 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 Lite in the browser.

I tried to reproduce the issue when...

• uBO Lite is the only extension.
• using a new, unmodified browser profile.

Description

I am using uBlock Origin Lite and I've encountered a significant UI accessibility problem when using the extension on 2 vertical monitors.

The slider for filtering modes is nearly invisible. The current contrast difference between the slider and the background is about 5%.
No one looks at monitors at an angle of 90deg, especially it 2-4 available.
On high-resolution vertical screens, it completely blends with the background. I literally cannot see where the slider is and cannot hit it with my mouse.

You seem to be "saving" my eyes with low-contrast UI elements, but at the same time, the bold, bright text in the interface (like the domain header) is a "Dark Mode killer." It's so bright it actually hurts to look at.

Please , increase add clear visual boundary.
Add a simple, "childish" CSS property

#slider {border: 1px white solid};

A specific URL where the issue occurs.

main

Steps to Reproduce

click

Expected behavior

Actual behavior

no border

Troubleshooting information

uBlock Origin Lite 2026.222.1657