Mozilla Firefox
An open-source browser with extensions, container tabs, privacy controls and cross-platform synchronization; this page covers the archived macOS universal installer and a careful migration workflow.
What Firefox is useful for
Firefox combines a mature browser engine with an open extension ecosystem, container tabs and detailed site permissions. Containers help separate some login cookies, while privacy protection changes how scripts, cookies and trackers behave. These features solve different problems and should be checked independently.
Extensions, profiles and sync
An extension may read page content, downloads, the clipboard or selected hosts. Review its publisher, signature, update history and requested permissions before installation. Sync can carry selected passwords, history, bookmarks and settings across devices, so shared computers need a deliberate field and session policy.
Maintenance note
This page reviews Firefox 153.0.1 for macOS, extension permissions, container tabs, synchronization, profile migration and privacy settings. Content review date: 2026-08-23.
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Firefox 153.0.1 macOS installation and privacy setup guide
Begin with a clean profile, verify language, search and permissions, then migrate bookmarks and extensions one at a time so problems remain easy to isolate.
Before you start
- Confirm the supported macOS version and reserve space for the universal DMG and profile directory.
- Export bookmarks and make a list of extensions; store passwords and recovery information separately.
- List the sites and accounts that need special cookie, notification, media or download permissions.
Installation steps
- 01
Install the universal DMG
Open the macOS DMG, move Firefox to Applications and check the version and update channel on the About page after the first launch.
- 02
Set the basic browser profile
Choose the language, default search, home page, tab restore and privacy level, then verify login, media and download behavior on a normal site.
- 03
Import bookmarks and extensions
Import bookmarks first, then add extensions one at a time and read each permission prompt. Migrate passwords and autofill last.
Quick start
- 01
Review site permissions
Use the address-bar permission panel to check cookies, notifications, camera, microphone and pop-ups, and create exceptions only for sites that need them.
- 02
Organize accounts with containers
Create separate containers for work, study and personal accounts, test two logins first and remember that containers are not full system isolation.
- 03
Back up before an upgrade
Save bookmarks, the extension list and key preferences, and confirm the sync device list and recovery information before installing an update.
Usage tips
- Strong privacy protection can change scripts, cookies and login behavior; adjust only the current site while troubleshooting.
- Container tabs separate some cookie stores, but extensions and operating-system permissions still require individual review.
- Clearing site data can sign an account out, so check the recovery route before deleting cookies or history.
Troubleshooting and uninstall
What should I do when a site says Firefox is unsupported?
Check the archived version, JavaScript, cookies and site permissions, then compare the site in a clean profile before changing several extensions at once.
Why did Firefox become slow after an extension change?
Disable the newest extensions, inspect the browser task manager and startup tabs, and restore changes one at a time instead of deleting the whole profile immediately.
- Export data and end syncExport bookmarks, confirm password and recovery information are stored separately, sign out of sync and remove devices that should no longer have access.
- Remove the app and profile dataQuit Firefox and remove it from Applications. Keep the profile backup until the new browser setup has been verified, then decide whether caches and downloads can be cleared.
Frequently asked questions
Do container tabs fully isolate an account?
They separate some cookies and site data within Firefox, but they are not a full operating-system or extension sandbox. Review add-ons and permissions separately.
Does Firefox Sync back up every local file?
Sync covers the selected browser data fields, not arbitrary files in the profile or download directory. Keep an independent bookmark and profile recovery plan.
Are all extensions equally private?
No. Read the publisher, update history and requested host, page, download or clipboard permissions, and remove extensions that are broader than the task requires.