You can download the update directly on your device through the Google Play Store or by using the following link:
Firefox for Android version 19.0 has the following new features and improvements
- Support for themes
- Lowered CPU speed requirement from 800MHz to 600MHz
- Support for Traditional Chinese and Simplified Chinese localizations
Mozilla has also released Firefox 19 for PC, Mac and Linux which you can download from the company’s website or by using this link.