The ZIP contains the correct folder structure and the background image files.
  The XPI is missing these files entirely.

I encountered an issue when exporting a theme from Firefox Color. When I downloaded the XPI file, it contained only a `manifest.json` and **did not include the background image files** referenced in the manifest. This caused Firefox to reject the theme as “corrupt” when trying to install or import it. What I discovered during debugging: 1. Firefox Color provides both a **ZIP** and an **XPI** download. The ZIP contains the correct folder structure and the background image files. The XPI is missing these files entirely. 2. Because the XPI is missing required assets, Firefox treats the file as corrupt. 3. Importing the broken XPI through the Add-ons Manager or uploading it to AMO also triggers corruption or validation errors. 4. I had to manually inspect the ZIP, extract the proper `images/` directory, and rebuild the XPI myself. 5. I ended up using ChatGPT to troubleshoot the issue, confirm expected manifest structure, correct extension ID mismatches, and verify JSON formatting. The issue appears to be that Firefox Color’s **XPI exporter is broken or incomplete**, producing theme packages that cannot be installed or validated without manual repair. It would be helpful if Firefox Color’s XPI export included all necessary files consistently and matched the structure found in the ZIP download.