Greasy Fork is available in English.
Change the font, size, width and background of a work + blacklist: hide works that contain certain tags or text, have too many tags/fandoms/relationships/chapters/words and other options + fullscreen reading mode + bookmarks: save the position where you stopped reading a fic + number of words for each chapter and estimated reading time
< 脚本 AO3: Fic's Style, Blacklist, Bookmarks 的反馈
No sorry, my bad, it's because I've closed my github account. I'll update the script shortly.
Updated. You should be able to install it now without errors
Don't know if this'll be seen but I'm afraid trying to install just throws this:
404 - at https://raw.githubusercontent.com/Schegge/Userscripts/master/images/ao3icon.png
I don't know if I've somehow managed to putz an installation that only requires one or two clicks but I wouldn't put it past me