Originally Posted By: kevs
yes I force quit the app and have to relaunch.
I don't have a consistent url to test either.

So question remains,

In Safari -- or Firefox

if you have ten windows up, and one is "locked"
how can you force quite just that one?

Which itself begs a question: why have ten windows open in Safari?

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FWIW —along with artie's Exposé suggestion —command-accent (⌘`) can be used to navigate amongst an app's open windows.