Firefox is well on its way to becoming a popular development platform in its own right, attracting developers who are busy creating extensions using third party API’s.

ProgrammableWeb has put together a list of 12 Firefox mashups that use API’s in order to help the productivity of users. The mashups range from sharing intriguing content on digg, delicious and facebook to uploading files to Flickr, Picasa, YouTube and Box.net accounts.

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