UXP (Pale Moon, Basilisk, etc) not working anymore

**Describe the bug**
Since several releases ago, at least several months or 1 year ago, an Hydrogen update left any UXP-based browser including Pale Moon, Basilisk and others without support.

The interface just loads an empty page with neither error nor warning in console.

**To Reproduce**
Steps to reproduce the behavior:
1. Open DevTools
2. Change to console
3. Go to https://hydrogen.element.io
4. Wait

**Expected behavior**
Interface loading and at least some error being thrown or just get it working.

**Screenshots**

**Desktop (please complete the following information):**
- OS: Devuan 4 Chimaera and Debian 11 Bullseye
- Browser: Pale Moon 31.2.0.1 and Basilisk
- Version: Hydrogen version 0.3.0, 0.3.1 and 0.3.2 as far as I could get recently (I didn't record the error back then)

**Additional context**
* Since about a several months or 1 year ago.
* Having the AdBlock extension enabled or disabled doesn't change the behavior.