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HAR files, the console, hard refreshes and bug reports, step by step, with a free tool wherever one saves the trouble.
Free toolHAR analyzer
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Browser and deviceWhat is a user agent? How to read a user agent stringBrowser and deviceHow to hard refresh in Chrome, Edge, Firefox and SafariHAR filesWhat is a HAR file? How to make, read and share one safelyBug reportsThe bug report template that actually gets bugs fixed