SankakuAddonJS
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Adds a few quality of life improvements on Sankaku Channel: Automatic image scaling, scrolling to image, thumbnail icons for loud/animated posts, muting/pausing videos, + - tag search buttons, a tag menu which allows for tagging by clicking, 'Choose/Set Parent' modes, easier duplicate tagging/flagging. Fully configurable through the Addon config.
Unlimited Paginator WorksJS
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Makes any(?) page with a paginator on various Danbooru clones "bottomless"--blend pages together or separate each with a paginator.
Porn search on RARBG or TORLOOKJS
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Add two small buttons on some porn site's page to search for the movie's title on RARBG or TORLOOK. Based on 'IMDB to RARBG Torrent Search' from nickpapoutsis.
Webcomic ReaderJS
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Can work on almost any webcomic/manga page, preloads 5 or more pages ahead (or behind), navigates via ajax for instant-page-change, lets you use the keyboard, remembers your progress, and it's relatively easy to add new sites