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Link Alert: Identify PDF links, downloads in Firefox

There's a lot of extensions for Firefox that do something similar, but I like Link Alert's style. Link Alert is a Firefox add-on that changes your cursor depending on what kind of link you're about to click on. If it's a link to a PDF file, a PDF icon is shown next to your cursor. If it's a Word file, likewise. If the link opens in a new window, a new window symbol is shown, and so on. It works...