Hi,

EDIT: It is now possible to customize the new tab page by adding your own CSS in the addon's preferences page from version 0.1.0 onwards.
Thanks for your patience.

It would take some time for me to add background customization for the extension.

However, I have found out a workaround to change the background color by changing some browser settings.
Link -https://support.mozilla.org/kb/change-fonts-and-colors-websites-use

Here's a screenshot on the dark mode version - https://imgur.com/a/I4Cjs

I'll add this to the description of the addon till I add background customization

Thanks