I've had Opera Next installed for a while, just to follow the progress of the browser. I don't use it as my default browser, in fact, I don't really use it at all.

After updating to the latest version, I noticed that space on my SSD started to disappear. I tracked that down to this folder: -

http://i.imgur.com/mbPxeIt.jpg

So Opera Next is using up nearly 7GB space there. Why is this? What are those files and why are they getting bigger and bigger when I'm not even using the browser?