navchandar / Twitter HQ Photo Downloader

As the subject states, doesn't work. Using Firefox 80 x64. No buttons EVER appear on Twitter images.

It is working as expected. Tested in latest Firefox.

The buttons appear only when an image is open (and when url contains 'photo')
For example : Install the script and open this link and wait for few seconds.

Buttons once again, no longer appear. I've refreshed the page (as that usually causes them to appear) several times, with no luck.