Hi Yxtqwf, welcome to Fandom Developers Wiki! Thanks for your edit to the Talk:RefreshThreads page.
The currently recommended version is the one on /code.js. The one on /code.2.js was, from what I remember, an attempt to fix a major bug Rollback had a few years ago, but then the original author came back and updated /code.js to fix that bug. I've been using the one on /code.js ever since and it's been working fine for me, so I rewrote that one so that one is now the one listed on the documentation page for installation. -- Cube-shaped garbage can 11:21, May 23, 2020 (UTC)