Ah yes, that’s a known limitation with Firefox on Zorin (and Ubuntu in general) — if it's installed as a Snap, it runs in a sandbox and can’t access files under /mnt or /media by default. That’s why Brave works (it’s not sandboxed the same way), but Firefox shows “File not found”.

To fix it, open a terminal and run:

sudo snap connect firefox:removable-media

Then restart Firefox and try again — it should now be able to load your local homepage.

Alternatively, you can just move the HTML file into your home folder and point Firefox to that — works without needing any special permissions.

Hope that helps!

Nathan --

I tried the terminal command "sudo snap connect firefox:removable-media" and received this: error: "snap "firefox" is not installed"

I have no idea what "snap" is but clearly Firefox is installed because that is how I'm accessing this forum.

I would prefer to have the HTML file stay in it's current Data drive with other similar files.

Any other suggestions? Thanks.