Firefox Unbranded
TestingBot no longer recommends using Firefox Unbranded.
If you are looking to test unsigned Firefox extensions, you can use the load-extension command which will install signed and unsigned extensions on Firefox.
How to use
Typically you'll only want to use Firefox Unbranded for extension testing.
To test a Firefox extension, please see the following example:
DesiredCapabilities caps = new DesiredCapabilities();
caps.setCapability("platform", "WIN7");
caps.setCapability("browserName", "firefox-unbranded");
caps.setCapability("version", "latest"); // for example