Below are (most) of the userscripts I have written and published. Some scripts may not work, I don't periodically check all of them and just rely on reports when things stop working. Unless otherwise specified userscripts are for marumori.io (A wonderful place to learn Japanese by the way ^^)
Userscripts:
MM - Marumori Font Changer with Webfonts
Persistent find and replace (for AO3 - insert your own characters ^^)
MM - Find Earliest Next Review for level 8 Kanji and Vocabulary
MM - Auto Advance on Exact Match (fake lightning mode)
MM - Notes Sidebar with Rich Text Editor
MM - Selected Items in Study List Counter
MM - Auto Click Hints on Correct Answer
In Page Cleaner (Migaku Friendly) - For Satori Reader
MM - Conjugation Feedback Tweaker
MM - Blur reading stories during Reviews