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Follow OldVersion. Old Version. Add info. Mozilla Firefox 1. Mozilla Firefox 3. Mozilla Firefox 4. Mozilla Firefox 5. As the internet grows and changes, Firefox continues to focus on your right to privacy — we call it the Personal Data Promise : Take less.

Keep it safe. No secrets. Your data, your web activity, your life online is protected with Firefox. Download this browser extension to stop Facebook and Instagram from tracking you around the web. Firefox is available on all your devices; take your tabs, history and bookmarks with you. All you need is a Firefox account. Grab a high-resolution image of anything online with our screenshot tool built right in the browser. Firefox automatically blocks many third party trackers from collecting and selling your web activity.

From watching a web tutorial to keeping an eye on your favorite team, your video follows you while you multitask.

Download Firefox Firefox Privacy Notice. Get Mozilla VPN. Firefox for Android Get the customizable mobile browser for Android smartphones.

Firefox Focus Simply private mobile browsing. Privacy Promise Learn how Firefox treats your data with respect. Firefox Blog Read about new Firefox features and ways to stay safe online. Release Notes Get the details on the latest Firefox updates. Answer questions and improve our knowledge base. Search Support Search.

Home Firefox Download, install and migration Install an older version of Firefox. Redirected from Install an older version of Firefox Redirect 1. Warning: Firefox now includes downgrade protection to prevent corruption of user profile data. If you install an older version, you'll be prompted to create a new Firefox profile. Table of Contents 1 Installing a previous version doesn't fix most problems 2 I still want to downgrade — where can I get the previous version?

Note: Other problems can be solved with the Refresh Firefox feature. It restores Firefox to its default state while saving your essential information. Starting with version 4. Version 4. Firefox was originally released for Mac OS X Mozilla Firefox bit for PC Windows RoboForm for Windows v9.

Mozilla Firefox is a fast, full-featured Web browser.