Trying to pull some things from the user Document:
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Replies to a given post are scattered down through the thread. FR provides a View Replies link to check for replies, but it incurs a server delay and, in any case, only shows the first level of replies, not the replies to the replies, etc.
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FRTV can rearrange a thread's posts such that each one has its replies indented beneath it, and each reply in turn has its replies indented beneath it, etc., in a tree structure. We call this the tree view. By bringing replying posts closer to the post to which they are in reply, the tree view makes it easier to follow the various conversations that develop on a thread.
FRTV provides a button and a keyboard shortcut to toggle back and forth between the flat view and the tree view.
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Didn't see that.......before
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To activate the tree view, click the View as Tree button or key Ctrl-Alt-T.