Compatibility issue with Dark Reader (firefox)

Initially reported on talk page by IamNotU.

Expected Behavior

No compatibility issues.

Current Behavior

Unknown white bar displaying in the middle of a screen. Screenshot #1

Steps to Reproduce

Per talk page:

  1. In the latest Firefox, create a clean profile and install Dark Reader
  2. Log in to a Wikipedia account with RedWarn installed
  3. Set the Dark Reader mode to "Filter" or "Filter+"
  4. Scroll down the screen just a little, the white bar appears

Some information

Operating system: Unknown. Likely Windows or OS X-based. Browser version (e.g. Chrome 80): Unknown. Other scripts (if used, please link to your common.js and/or skin.js): common.js

Final checklist

  • I have included the version of the browser I'm running, operating system and other scripts (if used).
  • I have included logs, exceptions and / or steps to reproduce the issue.
Edited by Asartea