Mozilla Contributor Fixes 5-Year-Old Firefox Bug That Trapped Amazon in Top Sites

A Mozilla open-source contributor has resolved a long-standing Firefox bug, first reported on Bugzilla, where users were unable to remove Amazon.com from the browser's New Tab Top Sites grid despite repeated attempts. The bug stemmed from how Firefox categorizes Top Sites — distinguishing between visited history, pinned sites, and default curated tiles — with Amazon persisting as a default entry regardless of user action. The contributor initially proposed blocking the URL upon deletion, but Mozilla engineers pushed back, noting this would silently alter user settings without clear consent. Guided by a second reviewer, the contributor identified the root cause through targeted logging and implemented a more precise fix that respects user intent. The resolution was submitted as part of DEV Community's Summer Bug Smash challenge, powered by Sentry.
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