Combined mew's dark with many fixes with full res images and enabled right click
you can find skin that removes login requirement in profiles here: https://greasyfork.org/en/scripts/420256-instagram-removed-login-requirement
but with a recent change you can view pictures (without account) with the middle mouse button
in stories right click is accessible at the right edge of the video.
Dark version here: https://greasyfork.org/en/scripts/419882-instagram-full-res-dark-right-click
I don't actively use Instagram so report bugs or additions as comments