Firefox for Android's voice input feature lets you speak into the address bar instead of using the keyboard. Just tap the microphone icon and speak:

Enable or disable voice input

1. Tap the menu button (either at the bottom right on some devices or in the upper right of the browser) , then select Settings (you may need to tap More first) .
2. Tap Display.
3. Tap to put a check mark next to Voice input.

   

To disable voice input, follow the preceding steps and remove the check mark next to Voice input.

Use voice input

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

   

3. When the voice recognition prompt comes on, start speaking. Firefox will enter the words you've spoken into the address bar.
4. Tap Go to perform a search using your default search engine, or tap one of the other search engines below the screen.