I assume from my experience that you call the users blacklist with the onload event but i would suggest you call the users blacklist every time a new set of images is loaded (different pages of images from the 'next page' button). For most users it is not noticeable but i have an addon from chrome that allows for infinite scrolling where it will place all pages on the same webpage (only loads next page once you reach bottom as to not call too much from server) but only the first page set of images is effected by the blacklist because it is (probably) only called when the web page is loaded.

This would be useful to just make the site all around more flexible and user friendly and would allow a native infinite scroll feature if you were to ever implement it.

The only part of the site that would be effected are the search results and would most likely not have any performance impact and would probably speed up the process of removing the blacklisted images.

I didn't label your post as "Invalid" but I'll say that this would be more suited to tell the author of said addon. Or if it is an UserScript and you don't mind some programming, you can maybe add the piece of code that runs the blacklist c:

idk why my post was marked invalid, thats pretty stupid, but I was just suggesting a way to make the site better, I already fixed it on my end.

Considering that the "next page" button is just an anchor tag to... the next page... where exactly are you suggesting this "new set of images is loaded" event occurs, that they could attach to? onclick would be kinda pointless, and wouldn't have solved your problem with whatever addon you have, anyways. So...

Really, you're suggesting they make the images load dynamically first. And if they were to do that, I'm sure they would make sure the blacklist was applied to subsequently loaded images.

If the site sends a request for new images, that is when a request for the blacklist should also be sent. no matter what way, when, or how there is a request for images, they should be referencing the blacklist. Look i am not trying to ask this just because it would make it better for me, i already fixed it for myself. I am just giving a helpful suggestion to make the site all around more flexible and well made. A good bulletproof website will be ready for any changes or modifications users do so if they want to improve the site, they can. Its simply just a suggestion, if they dont change it, i wont be bothered.