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This is done to trick attack sites that might display clean content to the scanner, but not to the browser.
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Not all requests are generated by a user, as a user agent can make requests at regular time intervals without user input. Measuring browser usage in the number of requests (page hits) made by each user agent can be misleading. The usage share of web browsers is the portion, often expressed as a percentage, of visitors to a group of web sites that use a particular web browser.
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Yearly usage share of web browsers from 2009 to November 2020 according to StatCounter
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