Given that Firefox OS is still under development, and support for new hardware is going to be forthcoming for the foreseeable future, it's important to know how to test it. This page offers links to articles that provide information about various aspects of testing Firefox OS.
Miscellaneous testing topics
Marionette for Firefox OS
Writing Tests For Marionette
Getting help from the community
If you're working with Firefox OS, or developing applications you'd like to run on Firefox OS based devices, there are community resources to help you!