I have created documentation for Mozilla as their technical writer. I wrote pieces to show others how to use Firefox features. These two documents are for the Firefox iPhone app, Firefox for iOS, and the Firefox video chat feature, Firefox Hello.
Also at Mozilla I have created a training guide in which I teach volunteer technical writers how to write Mozilla Support articles. Here are some pieces from that training guide. These pieces show technical writers how to write articles on Mozilla Support, how articles should look, how to use proper language and tone, and how to create and add screenshots.