Extensions manager: Ignores theme color for text, black on dark grey icon
Summary:
Text and some icons are black on dark grey for me:

Steps to reproduce:
- open Inkscape
- Install extensions manager
- close Inkscape (could that please be mentioned in the dialog?)
- reopen Inkscape
- reopen extensions manager
What happened?
see summary
What should have happened?
Text should be legible, icons should be visible.
Version Info:
- Inkscape Version: 1.1-alpha (7a647e7a97, 2021-03-11)
- Operating System: Linux Mint 20.1