Blop.wav not reproducing on Firefox

[lisandro52]

Hi! It's me again.
After I spent some more time with the chat, I noticed that the "blop" sound wouldn't play on Firefox.
After some digging, I found that Firefox can't reproduce WAV files encoded with more than 16 bits, so I re-encoded the blop.wav file to 16 bits, and it now works properly.

Another issue I found with the sound is that the chat.js file wasn't properly loaded by Firefox, because the speechToText variable is only defined on Chrome, so I added a definition check for that and everything is running nicely! Again, I'm about to add a pull request to this issue so you can check it and merge.
Cheers!

[igorantun]

That's true, I guess I need to do more testing huh? Thank you once again for your contributions, those are always welcome and appreciated!