Seems to have been abandoned by the dev. It worked well before but in recent months, Instagram links redirect to tikvib even if you set it to imginn. This has been reported many months ago on Github to no resolution or any acknowledgement.

Great extension, does exactly what I hoped it would do. Whenever friends send me a link to an Instagram video, it now just opens in a 'normal' page with the necessary video playback options (those are always messed up on Instagram's own pages, and half of them aren't even there). This is perfect.

Let's me see Instagram stuff my friends send me without needing to have an account. Exactly what I was looking for

Works well. Hopeful of seeing this grow in the future to include other privacy front-ends for popular websites!