Minimal Gray од Aamir Raza

If you're finding that the native Dark Theme is too dark, this minimal gray theme may be for you.

Pairs well with the Dark New Tab add-on:
https://addons.mozilla.org/en-CA/firefox/addon/blank-new-tab-page/
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If you have any feedback or notice any issues, feel free to reach me at the Support Email listed on the left panel!