Avast Secure Browser vs Mozilla Firefox
| Avast Secure Browser | Mozilla Firefox | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | $3.33/mo | Free |
| Open source | No | Yes |
| Platforms | extension, Web | Android, extension, iOS, Linux, macOS, Web, Windows |
| Free plan | Yes | Yes |
| Paid from | $5.99/mo | — |
| Supported platforms | both | both |
| Browser engine | chromium | gecko |
| Built-in ad blocking | Yes | Yes |
| Tracking protection | Privacy Guard anti-tracking techniques | standard |
| Extension support | chrome_store | own_store |
| Cross-device sync | Yes | Yes |
| Open source | — | Yes |
Both are listed in Best Web Browsers, Best Privacy Browsers. On The Geeks Club, Mozilla Firefox scores higher on our published basis.