Often times, I randomly press "Print selection" button. What happens is, the print window starts loading, and sometimes that takes minutes. Only way out is waiting, or reloading the page.
Add a "Close" button even when printing preview is being loaded.
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Next time you are on a page where the preview takes a long time, could you check whether the Esc key will cancel the preview or whether Firefox is so busy that it is temporarily ignoring the keyboard, too?
ESC works, BUTits unclear the key can be used to cancel the preview, so i would still like a "Close" button
Also, the preview loading happens the first time a print preview is opened in a Firefox instance (as long as one firefox window is open, its ok. As soon as all Firefox windows are closed, and you open firefox again, the long print preview loading happens). The long load time doesnt seem to be affected by site.
And to clarify, its not like the loading is freezing the firefox. Its just that theres no (visible) option to cancel it.