Firerfox 158 is no longer obeying it's previous screen placement method. Can this change be undone?

Xubuntu 24.04.5 Firefox 158 Firefox used to position a new window on the screen in a somewhat predictable manner prior to 158. For example, if there was a blank space on the screen between other windows, the browser would locate it and be placed there. A new instance would also appear on the active screen (I have two: left and right with a single window manager spanning both) where the mouse was located. Now the window is just placed in some arbitrary locations and may appear on the non-active screen. I have a number of scripts that load various sets of windows on the screen (typically a number of xfce4-terminals and the browser) which used to pretty much work, but no longer as the browser windows can show up any place and must then be relocated. When I start a new session I have eight distinct desktops with many versions of Firefox on each. It is tiresome to have to relocate one browser window after another. Is there any option I can set that would revert to the older screen placement algorithm? Also, I asked this before and don't remember getting any satisfactory response. Why is the -geometry flag not supported on Firefox any longer? What's the opposition to giving the user control over this? I want some command-line method for accurately setting the size (WxH) and position (X:Y) of the browser window on the screen. Am I missing something here? Thanks for any pointers.