Pick Firefox if
You want an open-source browser that is not built on Chrome’s engine.
The catch. A few web apps are tested in Chrome first, and it runs Firefox add-ons rather than Chrome extensions.
Firefox vs Dia
Firefox is best for an independent, open-source engine. Dia is best for AI in the browser.
Pick Dia if
You want an assistant that reads your tabs and does writing and research with you.
The catch. It needs an Apple Silicon Mac on macOS 14 or later, and its best AI features are paid.
Firefox vs Dia, feature by feature
| Firefox | Dia | |
|---|---|---|
| Engine | Gecko | Chromium |
| Vertical tabs | Yes, in settings | Yes |
| Sites on screen at once | Two, in Split View | Two or more, in Split View |
| Separate workspaces | Profiles and tab groups | Profiles, each in its own window |
| Ad and tracker blocking | Trackers, not ads | Built in, ads and trackers |
| Extensions | Firefox add-ons | Chrome Web Store |
| Platforms | macOS, Windows, Linux, iPhone, Android | macOS (Apple Silicon) |
| Open source | Yes | No |
| Price | Free | Free; Dia Pro $20/month |
| Development | Active | Active |
Questions
Is Firefox better than Dia?
Neither wins everywhere. Firefox is best for an independent, open-source engine; Dia is best for AI in the browser. Pick Firefox if you want an open-source browser that is not built on Chrome’s engine. Pick Dia if you want an assistant that reads your tabs and does writing and research with you.
Do Firefox and Dia block ads?
Firefox: Trackers, not ads. Dia: Built in, ads and trackers.
Which extensions do Firefox and Dia run?
Firefox: Firefox add-ons. Dia: Chrome Web Store.
Where do Firefox and Dia run?
Firefox: macOS, Windows, Linux, iPhone, Android. Dia: macOS (Apple Silicon).
Are Firefox and Dia free?
Firefox: Free. Dia: Free; Dia Pro $20/month.