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Enable manual update on modified userscripts #1743
I've looked into this a bit now. Unfortunately, whether you use the wrench to 'Check for Updates' to everything, or the context menu, it's the Add-ons Manager issuing the exact same call, so we can't tell them apart. It passes in the update listener, and that object seems to be defined in a private scope.
So "just via the context menu" might be hard. Re-implementing those internal firefox bits seems fragile, so probably not a feasible path.