When I set my theme to a balanced option in Firefox Colourways, the download progress bar is not legible. This bug does not occur in other themes. Steps to reproduce: 1. Set theme to a balanced theme (e.g. Lush — Balanced or Elemental — Balanced) 2. Download a file large enough that you will have time to open the downloads panel 3. Open the downloads panel at the top right Expected behaviour: Progress bar is legible. Actual behaviour: Progress bar is illegible. Screenshots: Other themes: https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2022-01-04-00-51-29-48531e.png Balanced/Light themes: https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2022-01-04-00-54-22-772b96.png