The weirdest thing happened to me some minutes ago. I was on google.com, searching when suddenly, chrome asked permission to use my... facebook credentials!
I managed to recreate the event. The following steps worked every time:
- I visit facebook.com and login to my profile.
- I log out of facebook.com
- I go to google.com and search for “facebook”
- I leave the results page open.
- After a couple of seconds (sometimes, up to 20 seconds), the credentials pop-up appears!
(For the record: OS X 10.8.3, Google Chrome 26.0.1410.65)
This probably means two things (and any input on this is more than welcome):
- google.com makes my browser to ask for elements coming from www.facebook.com.
- Had I been logged in (or maybe, despite me not being logged in) to facebook.com, facebook would be able to know that I searched for a specific term in google.com!
As I said, any input on this is more than welcome, I don’t claim to be an expert.
As pointed out on this HN thread, this is probably due to a prefetching technique Chrome uses to speed browsing.
Even so, this behaviour is probably giving out information to third parties about me that I wouldn’t want to give away.