Open the JPG image file you want to convert into an icon. With the plugin, you merely need to save the file with the file extension of .ico to create the icon.

Find an extension who's icon you want to change, and swap out the icon_19.png file with the icon you found online. When you restart Chrome, your new icon should show up in its place.

The free Chrome extension Attachment Icons for Gmail replaces the paperclip with standard Windows file type icons for PDFs, pictures, spreadsheets, and many other file types.

Microsoft has revealed new filetype icons for files that can be opened with its Office apps. The new icons are meant to match the ones for the Office apps themselves, and they're rolling out now.