Firefox is no longer supported on Windows 8.1 and below.
Please download Firefox ESR (Extended Support Release) to use Firefox.
Download Firefox ESR 64-bit
Download Firefox ESR 32-bit
Firefox is no longer supported on macOS 10.14 and below.
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Read about new Firefox features and ways to stay safe online.
Get the details on the latest Firefox updates.
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More About Mozilla
Get the Firefox browser built just for developers.
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Android Honeycomb (version 3) will no longer be supported.
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Your system may not meet the requirements for Firefox, but you can try one of these versions: