Mozilla Firefox vs Vivaldi
Mozilla Firefox
firefox.com
Vivaldi
vivaldi.comSide by side
| Figure | Mozilla Firefox | Vivaldi |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | Yes | — |
| Web | Yes | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| Plans published | 1 | 1 |
| Spec score · Web browsers | 9.0 (#11) | 8.8 (#17) |
| Browser engine | gecko | chromium |
| Built-in ad blocking | Yes | Yes |
| Cross-device sync | Yes | Yes |
| Extensions | Firefox extensions add browser features and tools, with thousands of free extensions available through addons.mozilla.org. | Vivaldi supports Chrome extensions, and its Android browser also supports extensions. |
| Extension support | own_store | chrome_store |
| Founded | 2004 | 2014 |
| Free plan | Yes | Yes |
| Open source | Yes | No |
| Supported platforms | both | Desktop downloads are listed for Windows, macOS, and Linux, and the site also has Android and iOS browser pages. |
| Product | Firefox is a web browser that Mozilla describes as fast, private and useful across devices. | Vivaldi is a customizable web browser with built-in tools for browsing, productivity, and privacy. |
Plans
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.
Vivaldi
Vivaldi is a free Chromium-based web browser for Android, iOS, Linux, macOS, and Windows. It combines tab organization with built-in browsing and productivity tools. Users can group tabs in two-level Tab Stacks, arrange them into Workspaces, or view pages side by side with Tab Tiling. Included tools are Mail, Calendar, a Feed Reader, Notes, Sync, and webpage translation. Vivaldi supports Chrome extensions, including in its Android browser. Privacy features include ad and tracker blocking, cookie-warning hiding, and private windows; the maker says Sync uses end-to-end encryption for synced browsing data. Its privacy policy says each installation sends a daily HTTPS message to Vivaldi’s Iceland servers with an installation ID, version, CPU architecture, screen resolution, and time since the previous message. Vivaldi says its Security Group reviews code and new technologies, handles vulnerability reports, and prepares fixes. The company is based in Oslo, Norway, and was founded in 2014.