> I am encountering a similar problem with Thunderbird as well. The current Thunderbird release doesn't have the code for bug 1671770 live, so that can be ruled out. Other Firefox windows _should_ still be responsive while the file-picker is busy, though. As Marco noted, this is usually due to network shares. Does this happen more often in certain subfolders? Alternatively, if you turn off OneDrive (or whatever else you might be using), does this still happen? Separately, can you try taking a [Firefox profile](https://profiler.firefox.com/) while creating a slow folder? (To work around a known bug, make sure to open the profiler in a separate window, and stop the profile _before_ closing the file-picker. When you upload the profiler, make sure "Include hidden threads", the topmost checkbox, is checked.)
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> I am encountering a similar problem with Thunderbird as well. The current Thunderbird release doesn't have the code for bug 1671770 live, so that can be ruled out. Other Firefox windows _should_ still be responsive while the file-picker is busy, though. As Marco noted, this is usually due to network shares. Does this happen more often in certain subfolders? Alternatively, if you turn off OneDrive (or whatever else you might be using), does this still happen? Separately, can you try taking a [Firefox profile](https://profiler.firefox.com/) while creating a slow folder? (To work around a known bug, make sure to open the profiler in a separate window, and stop the profile _before_ closing the file-picker. When you upload the profiler, make sure that "Include hidden threads", the topmost checkbox, is checked.)