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Enterprise Firefox XSLT support timeline and planned removal

Firefox Enterprise Installation and updates
TyDraniu replied 22 hours ago
srikanth.kesapatnapu
srikanth.kesapatnapu

We are evaluating Mozilla Firefox/Firefox ESR as a temporary workaround for an enterprise application that currently depends on XSLT. Our application is expected to be upgraded by the end of February 2027, after which the XSLT dependency will no longer be required. We understand that Mozilla is investigating the deprecation/removal of XSLT from Firefox, but we have not found a confirmed removal date.

Could you please confirm: Is there a planned Firefox or Firefox ESR release in which XSLT will be disabled or removed? Can you confirm whether XSLT is expected to remain supported through February 2027? If removal is planned, which Firefox/ESR version is expected to remove it? Does Firefox ESR provide any additional guarantee or extended support for XSLT? Is there an official Mozilla roadmap or documentation that we can reference for our enterprise planning?

This information is important because we have approximately 5,000 users who may be affected, and we need to determine whether Firefox can safely be used as a temporary workaround until our application upgrade.

We are evaluating Mozilla Firefox/Firefox ESR as a temporary workaround for an enterprise application that currently depends on XSLT. Our application is expected to be upgraded by the end of February 2027, after which the XSLT dependency will no longer be required. We understand that Mozilla is investigating the deprecation/removal of XSLT from Firefox, but we have not found a confirmed removal date. Could you please confirm: Is there a planned Firefox or Firefox ESR release in which XSLT will be disabled or removed? Can you confirm whether XSLT is expected to remain supported through February 2027? If removal is planned, which Firefox/ESR version is expected to remove it? Does Firefox ESR provide any additional guarantee or extended support for XSLT? Is there an official Mozilla roadmap or documentation that we can reference for our enterprise planning? This information is important because we have approximately 5,000 users who may be affected, and we need to determine whether Firefox can safely be used as a temporary workaround until our application upgrade.

All Replies (1)

TyDraniu
TyDraniu
  • Top 10 Contributor

Hi, we want to remove it in all channels in August 2027. Deprecation is done through the pref “dom.xslt.enabled”. There's also a policy https://firefox-admin-docs.mozilla.org/reference/policies/xsltenabled/ . After August, the code base of XSLT and corresponding tests will be entirely purged.

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