Connection interrupted

I use Firefox browser, Windows XP SP3, with Videotron as ISPs, for some time, in several pages, I have portions of the page displaying the message''Login''interrupted, this seems to be advertising but sometimes they are things that could serve me, and I did not have access, if I copy the address in IE, everything looks okay ...

I do not know how to prevent this to happen, the version of Firefox I use is: 3.0.7

Thank you in advance!

Which site for example?

Well, this morning, everything seems to work correctly, I can not find a site that Capote, weird, last night I had a lot of frames that had connection interrupted ... when I have an example, I return to the links in the meantime, I continue to do testing.

Thank you for responding!

After tons of tests, it seems that these are advertisements that do not appear in the background, it is like this, I wondered why only Firefox blocks them because they're not Pop - ups, but many managers as part of the page ... Here's an example

http://download.cnet.com/Return-to-C...-10243510.html

In this connection, I have two frames that show''Connection interrupted the connection to the server was reset while loading the page.

I have nothing against Pop-Up Stoppers, but usually they do not display pages correctly, no?