+++ This bug was initially created as a clone of Bug #1076897 +++ In bug 1069953, i want to make the min, max & bucket_count args of registerAddonHistogram() optional. The pdf.js version we ship in Nightly should handle this before we land that change. This means changing the signature from: registerAddonHistogram(in ACString addon_id, in ACString name, in uint32_t min, in uint32_t max, in uint32_t bucket_count, in unsigned long histogram_type); ... to: [optional_argc] void registerAddonHistogram(in ACString addon_id, in ACString name, in uint32_t min, in uint32_t max, in uint32_t bucket_count, in unsigned long histogram_type); in unsigned long histogram_type, [optional] in uint32_t min, [optional] in uint32_t max, [optional] in uint32_t bucket_count);