Did you check the sessionstore.jsonlz4 file that Firefox creates when you Quit the browser with the scrounger tool?

• https://www.jeffersonscher.com/res/scrounger.html

Do those hidden windows have different k/v value pairs compared with windows that show ?

Thanks for the suggestion...

Yikes... what a mess of JSON. I have no love for JSON, and this is a mess to parse by hand. The Scrounger page breaks it down nicely, doesn't seem to notice any issues (don't know if it was designed to).

I can't really tell where a new window begins in that file, so it's impossible for me to compare key/value pairs.

Any hints on how to simplify the task?

You can open a JSON file in a Firefox tab and let the JSON viewer parse the file.

• https://firefox-source-docs.mozilla.org/devtools-user/json_viewer/

So, the JSON viewer is awesome, thanks!

According to the scrounger, window 1 is visible, window 2 is not. The JSON viewer shows very little difference, at least at the top level. Dimensions and location look valid. The ones that are different are "selected", "workspaceID" and "zIndex". I don't know if that's significant. Screen shot of the results for those windows is attached. I haven't drilled down further, since I don't know which way to go.

Any thoughts?

Thanks!

I notice that the windows have workspaceID:"6" and each have a specific zIndex what makes the window with the higher zIndex places on top of the other with a lower zIndex. With a workspaceID not being "0" like I see ,this might mean that the window is not in the current workspace if it isn't visible.

Does "workspace" correspond to Mac "Desktops"? I checked all the desktops and opened more, making a total of 6. They are all empty except Desktop 1. If I click-and-hold FIrefox in the dock and select "Show all Windows", it only displays four windows, when there are 8 listed in the Firefox Window menu.

Is there something else I can look it related to the workspaceID?

Thanks!