Your app crashes my browser
summary
Claims that memory leaks are widespread and detectable with the reporting API and that many top SPAs leak memory are backed by specifics: Nolan Lawson finds 10 out of 10 in his study, a past mitigation forces a hard reload after 15 soft navigations, memlab by Facebook uses Puppeteer and scenario files to take heap snapshots and diff them and often identifies leaks of about a thousand objects with a path to the root, and a recorder extension generates scenarios; fixes are usually removing event listeners or nulling retained references.
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