I can reproduce, using Firefox 22.04 with snappified Firefox. It doesn't have anything to do with the print dialog, though. I can reproduce with just Ctrl+S while viewing https://example.org . (The first time I do it, I usually just get one save dialog; but if I dismiss it and try again, I was able to reproduce it that time. This happened in two consecutive browsing sessions.) It seems like the issue is that file-save dialogs just keep appearing over and over and over again, and if you close one, there's a stack of ~tens more underneath. If you hold down the Esc key, then you might eventually clear all of them. So: the browser isn't frozen exactly; it's just covered up by a large stack of redundant dialogs. I suspect this is a snap-specific issue. I can't reproduce this in Firefox release direct from Mozilla. (Also, the save dialog looks a little bit different there.)
Bug 1847809 Comment 3 Edit History
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I can reproduce, using Firefox 22.04 with snappified Firefox (i.e. `/usr/bin/firefox` that ships with Ubuntu, at least in Ubuntu 22.04 and newer). It doesn't have anything to do with the print dialog, though. I can reproduce with just Ctrl+S while viewing https://example.org . (The first time I do it, I usually just get one save dialog; but if I dismiss it and try again, I was able to reproduce it that time. This happened in two consecutive browsing sessions.) It seems like the issue is that file-save dialogs just keep appearing over and over and over again, and if you close one, there's a stack of ~tens more underneath. If you hold down the Esc key, then you might eventually clear all of them. So: the browser isn't frozen exactly; it's just covered up by a large stack of redundant dialogs. I suspect this is a snap-specific issue. I can't reproduce this in Firefox release direct from Mozilla. (Also, the save dialog looks a little bit different there.)