To have better html rendering install kpart-webkit
(will be selected by default)

For konqueror quicktime movies, install kmplayer

For flash movies, install konqueror-plugin-gnash (or flashplugin-nonfree)

For additional Webkürzel see About/Config

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Konqueror suddenly shows blank pages only
(rendering broken, nearly all pages just white)

simply do
mv ~/.kde/share/apps/khtml ~/.kde/share/apps/khtml-backup
and disable "bad" adblock services