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Hi AbsolutgrndZer0, themes are still available, lots of them, but the powers of add-ons have been reduced and they can no longer rotate themes for you automatically, you have to switch among them and download them manually.

You can find themes on the Add-ons site here: https://addons.mozilla.org/firefox/themes/

You can change among themes using either the Add-ons page or the Customize tab.

To call up the Add-ons page, either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons
• type or paste about:addons in the address bar and press Enter/Return

In the left column of the Add-ons page, click Themes.

To call up the Customize tab, either:

• click the "3-bar" menu button > Customize
• right-click a blank spot on the tab bar (or right-click the "+" button) then click Customize
• (menu bar) View > Toolbars
  On Windows, tap the Alt key to activate the menu bar temporarily.

Then there's a Themes button at the bottom of the tab.

Thanks! I had no idea that themes was integrated now, I was still using Personas (but not rotating)