This will be available in 68, it's not in Nightly yet (will be when this bug is closed). I'll add some documentation about it but it works as you described. ``` about:newtab?endpoint=http://foo.com&theme=light // or "dark" ```
Bug 1510335 Comment 8 Edit History
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This will be available in 68, it's not in Nightly yet (will be when this bug is closed). I'll add some documentation about it but it works as you described, no pref or config required. ``` about:newtab?endpoint=http://foo.com&theme=light // or "dark" ```