Hi, no it will not. https://support.mozilla.org/en-US/kb/keyboard-shortcuts-perform-firefox-tasks-quickly

The color of the selected item bar changes when the window switches between being the active window (blue) and a background/inactive window (gray). There are lots of ways to make that "Library" window a background/inactive window, so it's not specific to the Windows key. If you experiment, can you confirm that's what's going on?

There can also be a color change if you initiate a Cut action, but have done a Paste yet.

jscher2000 said

The color of the selected item bar changes when the window switches between being the active window (blue) and a background/inactive window (gray). There are lots of ways to make that "Library" window a background/inactive window, so it's not specific to the Windows key. If you experiment, can you confirm that's what's going on?

When I click the windows key, I can see that the topmost selection in the history list turns grey

cor-el said

There can also be a color change if you initiate a Cut action, but have done a Paste yet.

I did not understand, can you say more clearly please?

Hi, if you have this turned on in Windows 10 Show or Hide Status Bar in File Explorer (option 1)

• https://www.tenforums.com/tutorials/89247-hide-show-status-bar-file-explorer-windows-10-a.html

Once activated open 2 Explorer windows and click on one then click the other. You will see the one you click or working in top bar changes colour and when click on the other it will change and so will the other.

Same principle in Firefox. It changes colour when it is the active window.