Women's health
Address bars are not immune. Browser address bars typically render in the system UI font (San Francisco on macOS, Segoe UI on Windows). Both are standard sans-serif fonts in the high-danger-rate category. Chromium’s IDN homograph protection catches many cases by displaying punycode for suspicious mixed-script domains, but it relies on script-mixing heuristics, not pixel comparison. A domain using only Cyrillic characters that happen to spell a Latin word (like “аpple” in all-Cyrillic) may still render in the address bar’s font and look identical.
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Finding the closest point
For years, Google has explicitly told developers that API keys are safe to embed in client-side code. Firebase's own security checklist states that API keys are not secrets.