As I too often do, after saving a web page with cmd-S, I mistakenly closed the tab while the page was still "downloading", and as usual, that created the annoying "Downlo… (read more)
As I too often do, after saving a web page with cmd-S, I mistakenly closed the tab while the page was still "downloading", and as usual, that created the annoying "Download Error" dialog.
(Aside: I use the Mozilla Archive Format 3.0.0 extension, but still, the page is in the cache, so go figure why this error always happens.)
This time, I had moved on to another Save activity, this time Save Image As, from the context menu, in my now-front tab, just as the error dialog appeared.
This combo resulted in having the Download Error in one dialog and the Save Image As dialog both open at the same time, and none of the dialog buttons or available controls would dismiss any of the dialogs. I could press them, I could activate the menus, but Quit was unavailable from the File menu. So Firefox wasn't frozen or unresponsive in that way, but it was stuck. I couldn't get rid of the dialogs or do anything else until they were gone.
I force closed with Activity Monitor.
I realize there was an extension involved, but it still seems like I should have been able to activate the buttons or the close X on at least one of the dialog boxes.
I don't need an answer, but I wanted to tell you about the issue. Thanks.