I've got a problem with PDF's in the TabPanel (only on Firefox). They are reloading everytime I switch tabs. The PDF is in a iframe.

Because of it the user can not compare two PDF files. When you click a tab with a PDF it loads 10 seconds, then you switch to a second tab and it also loads 10 seconds and so on....

I know this problem with Firefox has been around for years (which relates IFRAME, OBJECT, EMBED elements). It cannot be that there is no solution for this problem.

However, I have not found any for Extjs4 yet.

It would be great if someone could help me with it.