Please update this.
It was working very well for a while, then something changed and it stopped working.

I'd have assumed that Google probably changed something with their pages or scripts, except for the fact that this same version of View Image still works fine on Chrome and other Chromium-based browsers.

Works wonderfully

Do what it says, quick and easy.

Works as intended in firefox 75 and 68.7 ESR on linux.
If it doesn't work, check other extensions (most likely adblockers), or your about:config.
Perhaps you mess up your settings while trying to "hardening" your firefox or something else?
Five star because it does what it says.