This repo creates a "pseudo-locale" for Mozilla products in order to show the priority level of different strings for localization. After cloning this repo, do this once: $ make clone And then after each rapid release cycle: $ make tiers-update.txt If diff looks ok: $ mv tiers-update.txt tiers.txt To iterate, make tweaks to tiers.txt, then: $ make And then do a build of the updated pseudo-locale and test.