Abyss vs Mozilla Firefox
Abyss
tryabyss.com
Mozilla Firefox
firefox.comSide by side
| Figure | Abyss | Mozilla Firefox |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | Yes |
| Web | — | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | — | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| Plans published | 1 | 1 |
| Spec score · Web browsers | 8.2 (#56) | 9.0 (#11) |
| Browser engine | chromium | gecko |
| Built-in ad blocking | Yes | Yes |
| Cross-device sync | Yes | Yes |
| Extensions | Abyss supports most Chrome extensions, including Manifest V2 and a subset of V3; some heavy extensions such as AdBlock and AdGuard may not fully load. | Firefox extensions add browser features and tools, with thousands of free extensions available through addons.mozilla.org. |
| Extension support | chrome_store | own_store |
| Free plan | Yes | Yes |
| Supported platforms | desktop | both |
| Privacy | The maker says Abyss has no telemetry, requires no account, works offline, and keeps data on the device unless optional sync is enabled. | Firefox's privacy notice says browsing history, form data, temporary files and cookies are processed on the device unless the notice says otherwise. |
| Product | Abyss is a private Chromium-based browser packaged with Electron. | Firefox is a web browser that Mozilla describes as fast, private and useful across devices. |
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.