Per-User Customization Options

Probably cookie-based.

site-wide

sidebar close on history change or not #63
navbar sticky or not
Multiple tokens support
Let the host supply multiple tokens at once to avoid overuse.

novel

font size
font family

artwork

native AI/R15/R18/R18-G... artwork filtering
We can filter them out using values supplied by Pixiv for each artworks.

search

add an option to do potentially very extensive searches Sort by bookmarks