Firefox does not recognize embedded iframe in local app page anymore

Linux Mint OS Firefox 152.0.4 Firefox does not recognize embedded iframes in local app page, anymore! I have a local docker app that can be accessed and functions properly,except for one thing The app has pages that have an iframe embedded within each page The iframe USED to display the correct iframe data for the page displayed NOW when an app page is accessed . everything on the page displays as normal and in the correct physical location,, EXCEPT for the iframe !!! The iframe contains a LOCAL url The page "looks" as if there is no iframe to be acessed ANY ideas??? Thanks, Anne