Looking it up, I think the more accurate term is actually "partner repacks." [1] They're versions of Firefox shipped with different default settings and/or an e

Looking it up, I think the more accurate term is actually "partner repacks." [1] They're versions of Firefox shipped with different default settings and/or an extension included by default at install time, IIUC. Though reading this rather opaque page [2] it doesn't seem to explicitly preclude patches to the compiled code, though it seems like they would forbid that. The key config file is distribution.ini. [3] [1] https://hg.mozilla.org/build/partner-repacks/file https://hg.mozilla.org/build/partner-repacks/file [2] https://www.mozilla.org/en-US/about/partnerships/distribution/ https://www.mozilla.org/en-US/about/partnerships/distributio... [3] https://brashear.me/blog/2017/12/07/how-to-deploy-firefox-with-bookmarks-and-addons/ https://brashear.me/blog/2017/12/07/how-to-deploy-firefox-wi...