I use Firefox mainly for my second Twitter account so I can't say if problem occurs only in TW but this problem has been driving me nuts for months. Twitter main feed only shows something like 20 tweets and after you scroll through them TW stops loading feed and you see "Back to top" message like if there are no more tweets. Feed mostly displays newest tweets with few coming from "In case you missed it" (but not always) and if you leave tab open it loads upcoming new tweets with no problem.

1. Tried safe mode, reset and reinstall and currently have no add-ons/extensions 2. Cleared cache/cookies 3. Tried disabling hardware acceleration 4. Site information: Secure Connection