Greasy Fork is available in English.
Loads more pixiv pages as you scroll down.
By default, XMLHttpRequest is used to load the extra pages, which may break other userscripts that don't monitor for page modifications. You can switch back to the old method (a hidden iframe) by modifying the top of the script.
Some pixiv functionality is lost on the loaded pages.
NOTE: This script does not work on the "new style" pages, e.g.:
2018-01-28:
2018-01-25:
2017-12-31:
2017-10-21:
2017-04-24:
2017-04-19:
2017-03-29:
2017-03-19:
2014-08-17: