I’ve made a userscript which might interest some of you. It reduces the length of long lists and adds a “show more/less” button. It was originally made a year ago because I got annoyed by the long AC lists on the artist/works page which made it hard to compare works.
I recently modified the script a bit so that it now also hides items on long country lists which recently have become a bigger problem. It currently only hides countries on the artist pages (release, RG and artist/releases) but I might expand it later so that it to also hides countries on pages that displays edits. The number of work ACs and countries shown are both set to 5, but that can be changed in the settings section of the script. I’ve only tested the script on the latest version of Firefox with Greasemonkey and Tampermonkey.