Partially fade/remove non-english, HQ thumbnails, mark as read, subs, version grouping etc.
Looks like the HQ thumbnails are broken due to site changes. I will look into it later. In the meantime, just disable the HQ thumbnails feature from the settings and you can still use the script for everything else.
Okay it should be fixed now. :)
Though I'm now also noticing that it doesn't appear to wait for default low quality thumbnails to load in before replacing them and starting to load HQ ones. This might be an issue if you have a slow connection (or if NH servers are busy or something). I might see if I can fix that later.
Anyways, keep in mind you can always disable HQ thumbnails from the settings if you want.
Thumbnails keep flickering unless script is disabled (Fireforx 133.0), when clicking a gallery ALL the images also flicker and then stop into a image not shown "picture" as if it failed to load the image in the previews, it's only fine when you click an image box, I hope it's get fixed...