Unlike other !RELEASE_BUILD customizations this pref is shipping in the branding files. I'm not sure if there's a reason for that, but it would be more consistent with other prefs if we moved that into the devtools.js pref file. https://dxr.mozilla.org/mozilla-central/search?q=selfxss.count&redirect=true&case=false
Priority: -- → P3
I don't think there's a reason. Makes sense to move to devtools.js.
There is a tangentially related discussion of pref file order in bug 1241858, but I don't think it should stop us from pulling things into one place here.
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