Maybe you made a typo but it looks like 3.6.28 was the last for the 3.6 Firefox releases. Still, as a security fix it’s a year old and the underlying technology is years out of date.
I don’t understand what you mean by loading the saved window versions in reverse order compared to the 3.6 release. Have you reported the bug or do you just expect it to be known and fixed without prompting?
Your bank is absolutely right in blocking a release that old for your own security.
https://bugzilla.mozilla.org/show_bug.cgi?id=712763
Loads saved windows in reverse order when starting, previous selected window ...
Status: RESOLVED FIXED (but its not)
Component: Session Restore
Target Milestone: Firefox 21 (someday I guess)