Steps to reproduce:
- Leave the scifi.SE front page open for a while.
- Wait for this to kick a bunch of questions to the top.
- Click the "X questions with new activity" banner (for X > 500).
The browser does a hard reload, or something other than the actual behavior.
The browser freezes up for a few seconds and then prompts me about an unresponsive script (tested: Firefox 51 on Windows 10).