I'm a beginner Pi 3 user and I was trying to get sound on Firefox ESR so I installed PulseAudio and edited a few config files. After this didn't work, didn't have ANY sound at all. I tried using the analog output and hooked it up to a bluetooth speaker without luck. I believe that my problem was related to the edited config files. Any ideas? I no longer care about sound for Firefox, just for Midori and Chromium. Thanks.