If you have an Android TV with Alexa, you can use voice commands.
You can use the following commands while pressing the Alexa button on the remote during the playback.
Examples:
"Start playback."
"Pause/resume."
"Fast forward 10 minutes."
"Rewind 30 seconds."
"Play from the beginning."
"Next episode."
"Previous episode."
If you are not sure if your Fire TV/Fire TV stick support Alexa, please check with the manufactures.