Every reply to a post on X, as one tree
Paste a link. Read it depth first: what you read turns green, a fully read branch folds away, your place is kept.
New thread? On a computer
X shows replies only to people who are logged in, so the Thread tree bookmark collects the tree right on x.com. Its Phone button opens it here, at your place.
Get the bookmarkHave the bookmark from before? Drag it again from that page to get Phone; your read marks stay.
Have a tree file?
A tree the bookmark exported, or raw replies saved from x.com, opens here and gets a link.
Paste a tree