Talking tomato

It reminds you the remaining time by speaking to you, so that you don't have to check it all the time.

"Game begins!"
"20 minutes left"
"15 minutes left"
"10 minutes left"
"5 minutes left"
"1 minutes left"
"30 seconds"
"10 seconds"
"5 seconds"
"Game over!"

You get the idea.

PS. This is an open source extension. Bug reports or PRs are welcome. Please visit https://github.com/zjlovezj/pomodoro-sound