Unverified50% confidenceFactExact time
Robert O'Callahan is the primary author of rr, a Linux debugging tool developed by Mozilla.
1
Sources
50%
Confidence
Long-term
Relevance
9/25/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedRobert O'Callahan worked at Mozilla for a long time.70% similarUnverifiedRobert O'Callahan is a major contributor to the core rendering engine of the Firefox browser.62% similarUnverifiedThe concept of Object-Oriented Programming (OOP) was first proposed by Alan Kay in the 1960s.50% similar
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