Ads that automatically redirect you from your daily browsing to a flashy sweepstakes have long been an incredibly annoying facet of the internet. But the versions that have evolved on the mobile web are particularly vexing, because they can trap you with a pop-up “notification” and nowhere to go. And a recent surge in these mobile pop-ups, even on reputable sites, has left people more frustrated than ever.

These redirects can show up seemingly out of the blue when you’re in a mobile browser like Chrome, or even when you’re using a service like Facebook or Twitter and navigating to a page through one of their in-app browsers.

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