Naturally I spot what may or may not be a problem when away from home for a few days and using somebody else's PC which is running FF20
Without being able to investigate further for several days I can't work out if this is a FF issue, if my site has been hacked or an effect of running Adsense.
Looking at a page on one of my sites we had a message "Firefox prevented this page from automatically redirecting to another page". Naturally as it wasn't my PC I wouldn't risk clicking OK and FF gives no information about the potential redirect. Viewing page source shows nothing in the header that would force a redirect. I am aware that this message is an option that can be switched off but again I don't want to play around with the settings on a borrowed PC.
Exploring my site I discovered that this only appeared on pages with Adsense.
Does anybody have experience of this being a spurious message or should I be speaking to my host about security?
After submitting this post the same message came up on return to webmaster world.