In some browsers you can disable iframes and then set them to be used on per site preferences. I know opera provides this functionality.

From [Quirksmode][1]:


> Disabling iframes
> 
>  - IE9: Internet Options -> Security -> Custom level (for Internet zone) -> (scroll down) -> Launching programs and files in an IFRAME ->
> set to Disable.
>  - Firefox: Go to about:config -> search for “frames” -> click on browser.frames.enabled
>  - Opera: Ctrl+F12 -> Advanced -> Content -> Style Options -> uncheck Enable inline frames


  [1]: http://www.quirksmode.org/iframetest.html