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Seiga/Nijie version

This script is truly awesome, it's saved me hours in searching for material to upload to danbooru.

Any chance it could be expanded to include seiga.nicovideo or nijie, which are the other two big sites for japanese artists? I'd do it myself but unfortunately I know absolutely nothing of javascript.

No. This script relies on Danbooru's pixiv/pixiv_id metatag. The seiga/nijie layouts would be too different anyway.