I never claimed it did. It does exactly what the description says. The purpose is to allow me to invert images that aren't legible due to Dark Reader, so they can be read without turning the whole page bright, which can be problematic for visually impaired users. If there was no point in inverting images, I wouldn't have spent my time making it. Not every add-on is going to appeal to everyone. That's why they're add-ons, you add them to the browser if they appeal to you. If they don't appeal to you, then don't install them.

If you had just asked, I might have considered it. It wouldn't be very practical to save information like that, since webpages are dynamic. But I've been known to take requests for free in the past. But someone writing a 2 star review to complain about my add-on (which I gave away for free, and no one forced you to install) missing a feature that I never claimed it had, that doesn't really inspire generosity.