You can test this by typing 'adb root' after installing the Android SDK (if it says it can't be run in production builds then certificate installation isn't going to work). Rooting your device is outside of the scope of this page but you may be able to find instructions on the internet, and is obviously taken at your own risk, etc.
===FxOS version: 1.1 - 1.4===
Installing reviewer certificates: [[Marketplace/Reviewers/Apps/Guide/Setup/Cert installation]]
===FxOS version: 2.0+===