It doesn't seem to matter what website I'm browesing, sometimes it's YouTube, sometimes Google, sometimes Amazon, or Twitter, or Google Maps, or BBC iPlayer, whatever. I've tried disabling these but it did not help. The extensions I have installed are AdBlock, Disconnect, Google Dictionary and Flag for Chrome. I've never closely inspected any of them or copied any URLs or taken screenshots, I usually try to close them as quickly as I can. They are not all the same website - some of them are blogs or forums, some are Poker websites, and others are just IP addresses that never seem to load. Ever since then, the same thing has been happening - random tabs will open, sometimes just 1 or 2 but sometimes there's at least 10, opening all at once, which makes Chrome slow down. It started with a tab opening one day as I was watching a video, I clicked on it thinking it was a popup (like the ones that come up when you click somewhere on a website, the ones that AdBlock miss) and it was just some random forum I've never seen before.
I use Chrome as my browser and for the past week or so, tabs have been randomly opening when I start Chrome, sometimes as I'm browsing.