Mozilla Firefox
Open sourceMozilla
- Category
- Browsers
- Version
- 157.0.1
- Manifest checked
- 2026-10-23
- Size
- ~89 MB
- Licence terms
- Open source (MPL 2.0) · free
- Supported OS
- Windows 11 · 10
- Install method
- Automatic install supported
- Developer
- Mozilla
- Downloads via this site
This links to Mozilla’s own download source. AfterFormat neither stores nor modifies installer files.
What it is
An open-source browser from the Mozilla Foundation. It is effectively the only major browser not built on Chromium — it uses its own Gecko engine — and tracking protection is on by default. Many people choose it specifically to keep an alternative engine alive while Chromium dominates the market.
When to pick this
If privacy matters to you or you want to avoid a Chromium-only web. If you depend on a Chrome extension that has no Firefox version, check that first.
Details
Enhanced tracking protection
Ad trackers, social trackers and cookie-based tracking are blocked out of the box, with no extension required.
Container tabs
Cookies are isolated per tab, so you can be signed in to the same site with several accounts at once — handy for separating work and personal accounts.
Independent engine
Sites built only against Chromium occasionally render differently. It is rare now, but it does happen.
After a reformat
A Firefox account brings it back
Bookmarks, history, saved passwords, extensions and open tabs return through Sync. Just sign in.
What does not come back
Values changed in about:config and customisations such as userChrome.css live only in the profile folder (%APPDATA%\Mozilla\Firefox\Profiles). Copy that folder before formatting and you can restore the lot.
Distribution
- winget ID
- Mozilla.Firefox
- Redistribution policy
- Open source licence
- Manifest checked
- 2026-10-23
- Official site
- https://www.mozilla.org/firefox/
The date the version and installer URL were checked in winget. This is separate from a usage-terms review or an installation test.
Original winget manifest