"TB3: Tor Browser's official .mozconfigs." adds a `--with-tor-browser-version` to `old-configure.in` (I could not find an issue number). However this has two problems: 1. #16439 relies on `CONFIG['TOR_BROWSER_VERSION']`, but a plain port of the patch to geckoview 96 did not work, so I suspect that `CONFIG` is not updated with items from `old-configure.in` 2. [Mozilla is dismissing this file](https://bugzilla.mozilla.org/show_bug.cgi?id=1247781) So, my proposal is to move any of our changes from `old-configure.in` to `moz.configure`.