Mozilla Firefox vs Sizzy
Mozilla Firefox
firefox.comSizzy
sizzy.coSide by side
| Figure | Mozilla Firefox | Sizzy |
|---|---|---|
| Price from | Free | $12/mo |
| Free plan | Yes | — |
| Free trial | — | Yes |
| Open source | Yes | — |
| Web | Yes | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| Plans published | 1 | 5 |
| Spec score · Web browsers | 9.0 (#11) | 8.1 (#65) |
| Browser engine | gecko | chromium |
| Free plan | Yes | No |
| Supported platforms | both | desktop |
| Product | Firefox is a web browser that Mozilla describes as fast, private and useful across devices. | Sizzy is a desktop Chromium browser made for web developers, combining projects, devices, sessions, debugging, an API client, terminals and coding agents in one window. |
| Support | Mozilla provides Firefox help resources for desktop, enterprise, Android and iOS. | The FAQ directs users to the Help Center for documentation and says they can email support directly. |
Plans
Sizzy
- Monthly$15 a month
- Annual$12 a month
- Lifetime$499 a month
- Annual$144 a year
- Lifetime$499, paid once
In their own words
Mozilla Firefox
Mozilla Firefox is a free, open-source web browser that uses the Gecko engine. It is available on Windows, macOS, Linux, iOS, Android, and as a browser extension, and its download page lists availability in more than 90 languages. Standard tracking protection and built-in ad blocking are included. Total Cookie Protection isolates cookies so they cannot follow users between websites, while Tab Groups organize open tabs by project, mood, or task. A Mozilla account can sync bookmarks, passwords, and open tabs across devices. Firefox also offers access to multiple AI chatbots in one place, letting users choose whether to use them. Thousands of free extensions are available through addons.mozilla.org. Mozilla’s privacy notice says browsing history, form data, temporary files, and cookies are processed on the device unless stated otherwise. Automated translation and PDF alt-text suggestions use downloaded language models locally; Firefox says those features do not send page content, PDFs, images, or tab URLs to Mozilla. Firefox is listed at free.