Greetings from the Mozilla Add-ons team!

Mozilla has upgraded the signing for Firefox extensions, themes, dictionaries, and language packs to provide a stronger signature for a more secure add-ons ecosystem. This upgrade may impact add-on versions uploaded to https://addons.mozilla.org (AMO) differently depending on the date they were uploaded and whether they are self-distributed or distributed via AMO. Please see below for which add-ons will be affected.

For developers of add-on versions hosted on AMO that were uploaded prior to April 5, 2019.

• No action will be required; the most recent public version of your add-on will be re-signed automatically April 25, 2024 resulting in a version bump

• Developers will receive a confirmation email once the auto re-signing of their add-on is complete

For developers of add-on versions self-distributed that were uploaded prior to April 5, 2019.

• Action will be required as Mozilla is not able to automatically re-sign unlisted versions since the distribution is controlled by the developer and thus the AMO team cannot determine which version(s) to re-sign

• Action required: To continue to distribute any self-hosted versions uploaded to AMO prior to Apr 5, 2019, developers will need to submit new versions to AMO.

Self-distributed add-on versions that are not re-submitted by Apr 15 will no longer be installable on any version of Firefox 127: Nightly (Apr 15), Beta (May 13) or Release (Jun 11). Add-ons installed prior to Firefox 127 will continue to work for now, but we ask that you encourage your users to upgrade to the new, re-signed version of your add-on once you have re-submitted it to AMO. Any previous versions that are no longer in use do not need to be re-submitted to AMO.

Please feel free to reply to this email if you have any questions.

Regards,

Mozilla Add-ons team