Sometimes when you get sent a link to an mp3 file or something similar, you just want to download it. Usually you’d have to open it in your browser, wait for it to load and then save it. Here’s what you could do instead:
Open Automator and create a new service, follow the steps in the image below and save it. Then open System Preferences and go to the Keyboard pane, locate the service you created as per the second image, then double click in the circled region to set a keyboard shortcut (I chose ⌃⌥⌘D).
Now I just select the url of the content I want to download, press ⌃⌥⌘D and boom.

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