The Chrome browser on my Nexus4 started to showing the same overlay ad on every web site I visit.
I noticed it the first time using a hotel wifi a week ago. The nexus is not rooted but 'installing from unknown sources' is activated.
How can I find out what caused this and and how can I fix it?
Thanks for the question from Dan Hulme. I also see the ads using a cell connection.
p.s. I just noticed the app ad at the top is also always there.