I was able to reproduce this issue on macOS 13.2.1 using Fx 130.0 -> the "Upload" button from the Firefox prompt is already active(there is no delay before activating the button). The files can be uploaded by mistake on click. Verified fixed on treeherder builds : Fx 131.0b9 and Nightly 132.0a1(2024-09-19) -> there is a delay(~3s) before activating the "Upload" button from the Firefox prompt.
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I was able to reproduce this issue on macOS 13.2.1 using Fx 130.0 -> the "Upload" button from the Firefox prompt is already active(there is no delay before activating the button). The files can be uploaded by mistake on click. Verified fixed on macOS 13.2.1 using the treeherder builds : Fx 131.0b9 and Nightly 132.0a1(2024-09-19) -> there is a delay(~3s) before activating the "Upload" button from the Firefox prompt.