Firefox in-product URLs support.mozilla.org/1/firefox/%VERSION%/%OS%/%LOCALE% get filled in at run-time

Pontifications

• On Firefox for OS X, I when I select Help->Firefox Help I see a url with Darwin in it momentarily and then the “real” url after the redirect, same with WINNT on Windows
• The %OS% values are:
  • Darwin for OSX
  • WINNT for Windows
  • Linux for Linux
  • not sure what it is for Android (maybe Android?)
• nsIURLFormatter https://dxr.mozilla.org/mozilla-central/source/toolkit/components/urlformatter/nsURLFormatter.js
• The pref is app.support.baseURL and the value of that is passed to formatURL in nsURLFormatter.js
• all of the values inside %NAME% are replaced at run time when creating the url

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