Firefox Developer Tools vs Opera
| Firefox Developer Tools | Opera | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | Yes |
| Paid from | — | $0.33/mo |
| Open source | Yes | No |
| Platforms | Windows, macOS, Linux | Android, extension, iOS, Linux, macOS, Web, Windows |
| Free plan | Yes | Yes |
| Supported platforms | desktop | both |
| Browser engine | gecko | chromium |
| Open source | Yes | — |
| Built-in ad blocking | — | Yes |
| Extension support | — | both |
| Cross-device sync | — | Yes |
Both are listed in Best Web Browsers. On Samsung Mobile US Press, Opera scores higher on our published basis.