Support other Firefox-based browsers (Zen)

[paularmstrong]

It looks like things might be somewhat hardcoded for "Firefox", but it would be really nice to support other Firefox-based browsers like Zen (https://zen-browser.app).

[imadev26]

Great suggestion! Since Zen is built on Firefox, you can likely extend support by:

1. Detecting the user agent string (Zen includes "Firefox" in its UA)
2. Using browser detection that checks for Firefox/Gecko engine rather than hardcoding "Firefox"
3. Testing with navigator.userAgent.includes('Firefox') which should catch Zen too

Most Firefox extensions/features should work on Zen without changes since it uses the same rendering engine. If there are specific hardcoded checks, replacing them with engine detection (e.g., checking for Gecko) would make it compatible with all Firefox-based browsers.

Would be happy to help test or submit a PR if you point me to the relevant code!