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Rules
View All 26Cloud services offering remote Firefox may not use Mozilla marks in the service nameRestrictionCopyleft is file-level: Modifications are files containing Covered SoftwareDefinitionCovered Software may be distributed under a later MPL versionPolicyEnterprise deployment uses MSI or PKG installers and policies without extra licensingUse rightsESR 140 reaches end of life in October 2026; ESR 115 extended on legacy systems to March 2027LifecycleExecutables may be sublicensed under other terms that do not limit source rightsUse rightsFirefox ESR: a new major version each year, with security updates onlyLifecycleFirefox includes third-party code under other free and open source licencesCompliance
Evidence
View All 51about:license: Microsoft Distributable Code only as part of the productDocumentation excerptabout:license: most code is MPL, the remainder under other licencesDocumentation excerptAdmin reference: available installer typesDocumentation excerptAdmin reference: ESR released annually with security updatesDocumentation excerptAdmin reference: Firefox Professional Support descriptionDocumentation excerptAdmin reference: policies applied independently of the installerDocumentation excerptAdmin reference: two-weekly major releases from Firefox 155Documentation excerptBinary Components policy: code under licences other than the MPLPolicy excerpt
Sources
View All 25About MPL 2.0: Revision Process and Changes FAQLicensing FAQDistribution Policy for Mozilla SoftwarePolicyFirefox about:license template (toolkit/content/license.html.mako)Product documentationFirefox administrator reference: Configuring policiesProduct documentationFirefox administrator reference: Firefox and Firefox ESRProduct documentationFirefox administrator reference: Getting startedProduct documentationFirefox administrator reference: SupportService descriptionFirefox ESR schedule (whattrainisitnow)Product documentation