fix browser setup for Chrome (#857) (#865)

* fix browser setup for Chrome (#857)

* add automated test using chrome/firefox headers from test data

* prevent browser.json with "[REDACTED]" values from overwriting the browser.json necessary for tests

* update prompt to mention "Chrome/Edge" as viable options from which to obtain headers

* fix merge error

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Co-authored-by: sigma67 <sigma67.github@gmail.com>