It works surprisingly well most of the time.

There is an extremely annoying bug though where sometimes a random tweet will just disappear from the timeline. You'll get a brief glimpse and it suddenly disappears. And you may or may not come across it later. As though it jumped further down the line.

Anyone else notice that? What in the world might be happening there? This has been an issue for at least a couple years now.

Agreed; in fact, I've wondered how they managed to make it work so well previously. (But, haven't used Twitter lately, so maybe it broke.)

Twitter loses your scroll position when you go from a Tweet thread to a reply thread, then come back. This is what the extension fixes.

Twitter does keep your scroll position when you go from a "top-level" view ("For you", "Following", ...) to a Tweet thread, then come back.

I cannot reproduce this, but I don't doubt it happens for other users. Guess I am in the lucky bucket. Maybe Firefox users get an older version without some new "improvements". :)

How interesting. I experience this problem on both Chrome and Firefox (v121.0.1 on Ubuntu 22.04).

I am mildly curious about why only a subset of Firefox users are experiencing this. Do you mind sharing your Firefox version and OS?

I went to do a sanity check using your steps and unfortunately I missed the problem the first time around - when I go to a tweet thread, then a reply thread, then come back to the tweet thread, it is indeed scrolled all the way up to the top. So I was wrong, I am affected by the same issue, I just never realized it until I went looking for it. One positive I'm taking away from this is the realization that I use Twitter less intensively than I thought, because I wouldn't have noticed this without the explicit steps I don't think. :D

Same here, even after scrolling pretty far (on For you) if I click to open a post(?) and then the "left arrow" to go back to the feed my position is usually the same.

I think it used to, but recently it has been bad.