Pop-up allows first pop-up page and the second pop-up page (linked from the first one) but does not open the data in the second pop-up page.

Question

I want to print my online bank statement.
Please see screen shots below.
The webpage has a link that says:
VIEW STATEMENT
Click the link and a pop-up opens that warns you about downloading using a public-access computer or sharing a computer with others.
If you want to continue click OKAY.
When you click this link another pop-up appears (a pop-up within a pop-up)
but it is blank.
When the process used to work, the statement would appear.
MacBook running OS X 10.6.8
When I tried it with Safari everything worked as it should so the problem is not with the bank.
I went back to Firefox (my preferred browser) and did the troubleshooting RESET.
Nothing changed.
In the Tools menu - Page Info - Permission - Open Pop-up Windows is set @ Default - Allow
In Preference - Content - Block pop-up windows is unchecked
or when it is checked the website is listed in the Allowed column.
It is the correct url because when I clicked the yellow options bar to Allow it, FireFox automatically chose it.
I also tried adding the extended url as it appears on the web page which has the first pop-up link.
Firefox would not accept it.

Answer 1

Screenshots:
# Part of bank's webpage with the link to the first pop-up
# The first pop-up page with link to the statement pop-up page.
# The second pop-up page - blank where there should be the statement. The page appears but the data doesn't.