Huh?

What is that related to?

Can you provide a screenshot of that?

Or the URL for a testcase or an example of where we can observe that?

start any download, hit ctrl-j, goto "downloads" tag, and right before dl runs out , the numbers switch to a text: "a few seconds remaining"... no. dont do that.

Go to the Mozilla Add-ons Web Page {web link} (There’s a lot of good stuff here) and search for a download manager.

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Go to that message, and use the Undo link to its right.

agentK said

start any download, hit ctrl-j, goto "downloads" tag, and right before dl runs out , the numbers switch to a text: "a few seconds remaining"... no. dont do that.

Sorry, that's the way it is - no user "hack" is available to get around that. There's a security feature in Firefox that "waits" for the user's security application to complete scanning the download for viruses before showing the download is complete.