My ISP is running a transparent proxy server on port 80 as I found out from this thread

http://mailman.archlinux.org/pipermail/arch-general/2011-March/019172.html

Now from last two or three days, I keep getting pop-up ads from a particular domain on every website i go to - even on text only websites ! If i choose another proxy server in firefox , then that does not appear on any site. But i normally connect to internet, that specific pop-up to a very particular website appears on every single page. If I install adblock plus in firefox, then of course no ads are displayed.

So is it possible that my ISP is serving that ad by intercepting incoming http traffic ?

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