Every time I follow a link to a PDF in Firefox, before the document comes up (I have PDFs set to open an external Adobe Reader window rather than show up within the browser) a notification slowly slides out from the task bar and then slowly disappears back into the task bar. This causes about a three-second delay each time. I wished to disable the download completion alert.
You can! Here’s how:
Go to about:config (type that in the address bar) and change
Thanks to cor-el for answering the question and to Ed for asking it, on the Firefox support forum.