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Mozilla Firefox · legacy macOS compatibility
Mozilla's open-source web browser.
Only sourced records are listed. A download link is shown only when an official or open-source release URL can be tied to that exact version. An unlisted OS does not automatically mean the app cannot run.
Choose macOS manually when detection is unavailable.
| macOS | Version or support record | Download |
|---|---|---|
| Record for this systemmacOS Mojave 10.14 | 115 ESR | |
| Record for this systemmacOS High Sierra 10.13 | 115 ESR |
Sources & verification
● Last checked 2026-09-16
Mozilla Firefox Support ↗
macOS Mojave 10.14 · macOS High Sierra 10.13
Vendor download routes
These routes do not identify the compatible build above. Check the version, minimum macOS and Intel / Apple Silicon architecture before downloading.