Thankfully, there are some websites that don't save your passwords, including Natwest and Paypal. Your passwords are all visible in Chrome's settings You could set up a new user account on your computer, install Chrome, go to the sites and log in as your target - and if they ever change their password (perhaps because they read this) Chrome will helpfully synchronise the new one to your spy installation. Note too that once you've got these passwords, you can take them away and spy on their owner - who will have no clue that you've been there (certainly not a strange new bookmarklet in their browser bar). You can literally do it one handed with a couple of minutes' practice. Becoming a master password thief is, it turns out, easy. My personal correspondence from Facebook and Twitter tumbled shortly after, followed by Dropbox, Tesco, Amazon, eBay and various websites I help run. Within seconds I had access to a Google account, which controls my email, YouTube, Google Drive, photos, contacts - and perhaps most importantly, Google Play, which is linked to a debit card. It's not just the unimportant stuff that it gives up, either. 'Every day, millions of normal, every-day users are saving their passwords in Chrome. They don't expect it to be this easy to see their passwords.

Software developer Elliott Kember, who has demonstrated that even non-tech savvy snoopers can access all your saved passwords, says: 'the overwhelming majority … don't know it works like this. So unless you're able to perform your ablutions or fill your cup at an Usain Bolt-rivalling speed, you could be leaving yourself open to unscrupulous password thieves every time you step away from the computer. Open Chrome, open settings, and a couple of clicks later you can show the passwords one by one.

And I'm an amateur at this hacking stuff. Here's how many: 52 passwords in 57 seconds. I set myself an experiment to see just how many passwords could a speedy attacker really get hold of.

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