I'm hoping this is a once-every-4-years thingy rather than something that they want done manually for every single build:

Hello,

[Joe Bloggs], a reviewer at addons.mozilla.org, found an issue when reviewing version 1.21.1pre5616 of the add-on Tridactyl: Beta and requests additional information. You are receiving this email because you are listed as an author of this add-on.

[Joe Bloggs] wrote:

This version contains minified, concatenated or otherwise machine-generated code. Please provide the original sources, together with instructions on how to generate the final XPI. Source code must be provided as an archive and uploaded using the source code upload field, which can be done during submission or on the version page in the developer hub.

Please read through the instructions at https://extensionworkshop.com/documentation/publish/source-code-submission/ .

To respond, please reply to this email or visit https://addons.mozilla.org/en-US/developers/addon/tridactyl2/versions.

Thank you for your attention.

--
Mozilla Add-ons
https://addons.mozilla.org

Will need to do a little thinking about how to actually get this source code out with build instructions.