We are aware that some people are receiving warnings when trying to open certain pages on Mumsnet. This is related to a problem with one of the ads that we serve on some of our pages. Whilst we investigate further we've stopped serving any ads. As such, all pages on the site are safe to visit. Once the problem is resolved the ads will return in all their glory and we will request to be removed from the blacklist which drives these warnings.
Apologies for any inconvenience or scaring anyone!