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The infrastructure for loading extension-overrides.js no longer exists in ESR60, so these prefs had to be moved. Unfortunately, we can't just dump the contents of extension-overrides.js into 000-tor-browser.js. The settings are actually partially built in tor-browser-build to conditionally include various bridge strings as well as localization settings. So, we piggy back off this existing build process and just append the contents of the partially generated extension-overrids.js to 000-tor-browser.js.
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