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Mozilla Firefox · legacy macOS compatibility
Mozilla's open-source web browser.
Only sourced records are listed. An unlisted OS does not automatically mean the app cannot run; it means this database does not yet have reliable evidence for it.
| macOS | Final version / lifecycle | Status | Notes | Source |
|---|---|---|---|---|
| macOS Mojave 10.14 | 115 ESR | ● Verified version | Firefox 115 ESR is the last supported branch for macOS 10.14 Mojave; Mozilla extended security updates through March 2027. | Mozilla Firefox Support |
| macOS High Sierra 10.13 | 115 ESR | ● Verified version | Firefox 115 ESR is the last supported branch for macOS 10.13 High Sierra; Mozilla extended security updates through March 2027. | Mozilla Firefox Support |