Tool doesn't load in Firefox private window if opening from address bar

[Shaun-Meechan]

I was recently using the tool to test some redux on a site I work on. Normally when I do this I use a normal window and a private window. This is when I noticed the tools don't load when in a private window when in Firefox if opening from the address bar.
Here's an example using just a public website:

Which works fine in a normal window

But won't in a private window.

However, if you right click and open "To right" it works as expected

I don't see any errors but happy to provide logs or whatever helps. Here's the site I used as an example: https://www.bbc.co.uk/sounds/play/live:bbc_radio_one