Lately I was searching on tex.sx from the search form at the top of the page. After a first search, I positioned the cursor somewhere halfway in my previous search terms and started to type additional keywords. Upon automatic expansion of the search form, the cursor was placed at the end of my input, leaving the words I was typing garbled.
This is annoying, especially since it takes a second before the search form expands, so I'd have to wait for that time before editing my search terms.
I'm using Debian Iceweasel, the version string is:
Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:126.96.36.199) Gecko/20111108 Iceweasel/3.5.16 (like Firefox/3.5.16)