- One is a project page, the other is a product
- Who each one is for
- Where the two meet
- Picking an engine to build on
- Tab Groups and the way you work
- Privacy settings you don't have to find
- Phone and desktop
- Common mix-ups to avoid
- Choosing for a whole team
- For developers: test on both engines
- Try both for a week
- Frequently asked questions
Choose Firefox if you want a finished browser from Mozilla with tracker blocking switched on by default. Choose Chromium if you're a developer or distribution after the open-source codebase behind Chrome. If you just want that engine in a ready-made browser for everyday use, the project's own site sends you to Google Chrome rather than to itself.
This comparison of Chromium and Firefox looks simple, but it's comparing two different kinds of thing. One is an open-source browser project aimed at people who build software. The other is a browser made by Mozilla for people who just want to get online. If you're deciding what to install, or which engine to test your website against, that difference matters more than any feature list.
| Chromium | Firefox | |
|---|---|---|
| Kind | Source project | Finished browser |
| Made by | Open-source projects | Mozilla Corporation |
| Site written for | Developers | Everyday users |
| Engine | Blink | Gecko |
One is a project page, the other is a product
The project's own site is a developer page about building and contributing to code. It even carries a line for anyone who's landed there by mistake: "Looking for Google Chrome? Download Google Chrome". In other words, the project points everyday users to a different browser altogether.
So when people compare the two, they're often really comparing Google's browser with Mozilla's, using the project name as shorthand. If that's you, the useful question is which engine and which company you'd like your browsing to sit with, not which download is more open.
If you're a developer, the comparison makes more sense: a codebase that feeds Google's browser and ChromeOS on one side, an independent engine on the other. Testing against both is a common way to catch layout bugs before your users do.
Under the hood, Blink is the project's rendering engine; Mozilla's is Gecko. That's the technical split that matters to web builders: two separate engines deciding how the same page gets drawn, which is why a layout can look right in one and slightly off in the other.
Who each one is for
The source project suits people who want to build, study or contribute to the code behind Chrome and ChromeOS, anyone packaging a browser for a distribution or another product, and testers checking how pages render in the Blink engine. If you'd like that engine ready to use day to day, its own site's advice is to download Chrome.
Mozilla's browser suits people who want a finished browser they can install and use straight away, with trackers blocked without setting anything up and the same browser across desktop, Android and iOS. It also has Tab Groups for sorting open tabs by project, mood or task, which is handy if you keep lots of tabs open across different pieces of work.
Because extensions are a big part of daily use, it's worth seeing what's available before you commit: we've picked out Firefox add-ons for screenshots and Firefox translation add-ons.
Where the two meet
Both are open in their own way: the project publishes its code for anyone to build on, and Mozilla publishes source docs for its browser and the Gecko engine. Both are used to test websites. And both matter to anyone who builds for the web, because between them they represent two of the rendering engines your visitors will see.
Where they part company is who they're for. One expects you to compile, package or contribute. The other expects you to install it and get on with your day.
Picking an engine to build on
If you're building a product of your own on top of a browser engine, the decision looks different again. You're choosing a codebase, a community and a pace of change you'll follow for years. Read each project's contributor docs, look at how changes are reviewed, and talk to people who've shipped on it before you commit. That homework matters more than any feature table.
It also helps to know who stands behind each codebase. The source project's own pages say it sits behind Google Chrome and ChromeOS, so the code you build on is the same code feeding two large Google products. Mozilla's about page says Mozilla Corporation makes its browser, and its source docs keep the desktop, Android and iOS versions next to Gecko. Neither arrangement is better in the abstract; what matters is whose direction you're happy to follow for years.
Tab Groups and the way you work
One feature on Mozilla's own list is worth a closer look if your screen is a wall of tabs. Tab Groups let you sort open tabs by project, mood or task, so a client's research, your inbox tools and a half-read article each sit in their own bundle. If tab overload is the reason you're shopping for a browser at all, try that one feature for a few days before you judge anything else.
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Privacy settings you don't have to find
Mozilla's own page says its browser blocks trackers automatically and protects privacy by default. The useful word there is default: you don't have to dig through settings or install anything to get that behaviour on day one.
If privacy is your main reason for choosing, read each browser's current privacy page yourself and check what's switched on before you start browsing, rather than relying on a comparison table.
Phone and desktop
Mozilla's source documentation covers desktop, Android and iOS versions alongside the engine itself. If you want one browser with the same habits on your laptop and your phone, that's a point in its favour.
The project's site is written for people building code rather than people choosing an app for their phone, so it doesn't offer the same kind of everyday guidance. If mobile matters to you, compare the finished browsers you'd install on each device rather than the project underneath.
Common mix-ups to avoid
- Compiling a codebase when all you wanted was something to read the news with.
- Assuming two products that share an engine will behave identically.
- Choosing on privacy without reading each one's own settings page first.
- Testing a website in only one engine and calling it done.
Choosing for a whole team
If you're picking a browser for colleagues rather than yourself, a finished product with its own updates and support pages is usually the easier thing to roll out. A source project is better suited to an engineering team that plans to build, package or test against it.
For developers: test on both engines
If you build websites, you don't have to pick a side. Install one browser built on Gecko and one built on Blink, then make a habit of checking key pages in each. Layout, fonts and form controls are the usual places differences show up. A short checklist keeps it quick.
Try both for a week
- Decide what you're comparing: an everyday browser, or an engine to test against.
- For everyday browsing, put the two finished browsers you're weighing on the same machine.
- Import bookmarks into both and use each for your normal work for a few days.
- In Mozilla's browser, set up a couple of Tab Groups and see whether they change how you work.
- Check the extensions you rely on are available in each.
- Keep the one you opened without thinking by the end of the week.
Frequently asked questions
Is Chromium just another name for Chrome?
No, it's the open-source project behind Chrome and ChromeOS.
Does Firefox work on iPhone?
Mozilla's source docs list a version for iOS, so yes.
Which engine sits inside the Chrome source project?
Blink, according to the project's own pages.
Who makes Firefox?
Mozilla Corporation, according to Mozilla's about page.
Which engine should I test my site in first?
Whichever most of your visitors use, so look at your own analytics rather than guessing.
Does Mozilla's browser need an add-on to block trackers?
No. Mozilla says it blocks trackers automatically by default.
