After selecting pronounce, the Firefox Web Console shows a bunch of identical warnings:
> unreachable code after return statement [[Learn More]](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Stmt_after_return)
each pointing to a line in mespeak.js. Edit: Same thing on [meSpeak's page](https://www.masswerk.at/mespeak/), predictably I guess. It's an issue with meSpeak.
Then, if you refresh the page, it throws an error:
> InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable
Chrome doesn't say anything similar, but it does let you know that it gets a 404 error when trying to reach the favicon.
mespeak.js. Edit: Same thing on [meSpeak's page](https://www.masswerk.at/mespeak/), predictably I guess. It's an issue with meSpeak.