Great extension. I do agree with Morcas : it should be possible to reduce padding and to set Speed Dial for the new tab page (which can be achieved with "New Tab to about:home" [1] I guess, as a workaround)

[1] https://addons.mozilla.org/fr/firefox/addon/new-tab-to-about-home/

Great to see a Speed Dial webextension, however, it would be even better if the addon could be set to Homepage/New Tab page and also support groups.

Edit: the left and right padding could use a setting for reducing the space used.

Verry Good

jyfg is car