How does Lastpass know the current URL in Chrome

Question

When browsing around in Chrome for Android, Lastpass pops up with suggestions if it recognizes the URL as one you have associated login details with.

How does it kno

Answer 1

I general using javascript, apart from Andoid functionality, and with some hacking, it is possible to get references to all open windows (and for instance get their URL). See this answer from 2009.