Add-ons • Theme licensing question

Hello,

I have a licensing question about a forked complete theme.

The theme uses a base theme licensed under MPL 2.0, and it also includes an icon set licensed under LGPL 2.1 or later. Is it legally possible to merge the whole forked theme, including both the MPL 2.0 theme code and the LGPL icon set, under a single MPL 2.0 license?

Or should the theme keep separate license layers, for example:

• theme code / CSS / base theme: MPL 2.0
• icon artwork: LGPL 2.1 or later

Thanks for the clarification.