I think you misunderstood the issue. It's not an issue with the phrase 'download complete' or 'download failed' that appears in the notification. Let me repeat the problem, Press Pause to stop between 1 and 99% during download, and then press Resume to complete it normally. Later, if you run it to play the actual downloaded video file. Then the issue is that the video file does not play with a warning pop-up saying "This is an unsupported file type."
Bug 1911037 Comment 6 Edit History
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I think you misunderstood the issue. It's not an issue with the phrase 'download complete' or 'download failed' that appears in the notification. Let me repeat the problem, Press Pause to stop between 1 and 99% during download, and then press Resume to complete it normally. Later, if you run it to play the actual downloaded video file. Then the issue is that the video file does not play with a warning pop-up saying "This file type is not supported."