Not that the world was lacking in ways to send content to its Kindle devices and apps, but if you still happened to feel unfulfilled on that front, Amazon's added Firefox to the list. The Mozilla-crafted browser is getting an extension that'll let users share blog posts, news articles and the like to various members of the Kindle family. Select the page or text, click the button and go -- well, once you've finished downloading the extension from the source link below, that is.