Noticed behavior: on some sites, when the user scrolls but the site finishes loading after it was scrolled, the site jumps back to the top - sometimes even multiple times but most definitely on load finish. Needlessly to say that this is very annoying.
Most sites don't use iframes anymore but some of our own site layouts (ie "home / overview" sites or sites containing multiple tools in general) do still use iframes to layout multiple tools.
The offender seems to be headscripts.js:
This explains why some sites jump multiple times.
Though the original intention of this scroll reset is unclear.
Uncommenting this line removes this unwanted behavior and doesn't seem to have any side effects so far.