Forum response - Install voices for Windows 10
These instructions work on Windows 10. For Windows 7, third-party language packs might be available.
- Open the Settings App.
- Select Time & Language.
- Select Region & Language.
- Press Add a language
- Select a language.
- The language should appear in your list. Press the "Options" button for a new language.
- In the "Language options" panel there should be a "Speech" section with a "Download" button under it, press it.
- Restart Firefox.
- Firefox will prompt you for the localized voice when you select Narrate in Reader View. Select the voice you've just added.