Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b2pre) Gecko/20081124 Minefield/3.1b2pre 1) Get latest Firefox 3.1 NB. 2) Visit URL http://k8.kreteni.cz/tz/mapa.php?tz=cz&osoba=133 3) Firefox stops response and after some time (>20s) renders map with many items styled by CSS. Page is rendered immediately in Firefox 2.0.0.18.

What styles make it slow?

It's about absolut position of lots of images. Removing div.tz img, img.p { position:absolute } from the stylesheet speeds things up.

I'd rather have things like this dependent so we remember to double-check when the other bug is fixed. It's not uncommon to need a separate fix for the seeming duplicates after all. :(

If someone can attach an unminimized locally saved version of the page (save page, complete) that still shows the problem, that would be very much appreciated.

Mozilla/5.0 (Windows NT 6.0; rv:49.0) Gecko/20100101 Firefox/49.0 Mozilla/5.0 (Windows NT 6.0; rv:46.0) Gecko/20100101 Firefox/46.0 I tested on the latest Firefox release(46.0) and latest Nightly build (49.0) using page from attachment and I can't reproduce the issue. I will close the bug. If anyone can still reproduce the issue on a current build, fell free to reopen it.