Firefox for Android's voice input feature lets you speak into the address bar to search instead of using the keyboard.

Search with voice input

1. Tap the address bar.
2. Tap the microphone icon:

   

3. Say your search terms out loud when prompted.

Enable or disable voice search

1. Tap the menu button
   
2. Tap Settings.
3. Tap Search under the General section.
4. Tap the switch next to Show voice search to toggle this feature on or off.