On some (belgian?) sites you sometimes see an irritating 'popup' asking if you want to fill in a short list of questions to improve the site. This userstyle immediately removes this frustrating stuff. (I only tested it on one site so i'm not 100% sure this will work on all insite-infected sites, but i hope to never see that stuff again)
Before
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After
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.ad {
/* Your ad can be here instead. 10K unique visitors for $5/day. Mail me. */
}