Here it allows me to right-click and Save as. What do you know? A MP4 entry appears in the list! I double-clicked on the entry, which opened a new (Facebook type!) tab containing the video. It still went to a pseudo full screen, but had the Network monitor open at the bottom. I cleared any entries that might be there from before, filtered on Media, and refreshed the page (F5). I then launched the Inspect console on the Network tab (Ctrl+Shift+E).

That's a pity, because I think if I could access VDH in this mode, it would most probably be able to download the Story video. I tried the VDH shortcut key (Alt + I) but it didn't show the VDH pop-up screen.

The normal Firefox toolbar isn't visible - so I can't even see the VDH icon. The same thing happens if I do any mouse clicks on the screen. (changing 'If I press ESC, the Story ends prematurely and goes back to normal Instagram. With 'User-Agent Switcher' you can fool websites into thinking the Firefox browser is running on various systems.

But your suggestion of changing the user agent led me to the mentioned add-on. Plus it allows me to have one profile running in mobile mode and the default profile still running Win10 mode. Creating the clean profile is probably not important - I just wanted to ensure no other add-on interferes.

I created a new ('clean') Firefox profile with the only add-ons being VDH and the '.

I have known about the Facebook trick for some time to download videos by going into mobile mode - replacing 'However, when I do this in Firefox, Instagram immediately jumps back to desktop mode (changes back to '.

Instagram story video download