Summary. "The prisoners were executed in a summary fashion."
Also means brief, concise. I guess a summary execution (which means without trial if I understand correctly) is a briefer process than an execution with a trial…
Would also properly qualify the rejection of an extension from the Chrome store, I guess, to go back to the main topic.
(yes, found out by translating from French :-) - sommaire also means basic, rudimentary, now I wonder what made us use this word for executions - the brevity, or the basic aspect, sounded like the latter to me in history lessons)