Multi-Account Containers are not their correct color in the new-tab menu.

[robinhogan]

Sanity checks (must complete)

• [x] I have read and followed the installation instructions in the README
• [x] I have not modified the userChrome.css file
• [x] I have tested the latest release for my Firefox version, or commit on master/beta branch (beta is for Firefox Beta only)

Describe the bug There is a Firefox Multi-Account Containers context menu that's available by clicking and holding the new-tab button. This menu functions normally but all container colors are rendered black instead of their container color.

To Reproduce Steps to reproduce the behavior:

1. Press and hold the new tab button.
2. Your listed containers are back instead of their assigned color.

Screenshots

System info

• OS: Windows 10
• Firefox version: 75

[muckSponge]

Hopefully this should be resolved now.