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A user who revisits a site shortly after changing or upgrading browsers may be double-counted under some methods overall numbers at the time of a new version's release may be skewed.

The Register reported in June 2008 that traffic from AVG Linkscanner, using an IE6 user agent string, outstripped human link clicks by nearly 10 to 1. This is done to trick attack sites that might display clean content to the scanner, but not to the browser.

Certain anti-virus products fake their user agent string to appear to be popular browsers.

In this case, the user's activity might be overestimated. 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. Yearly usage share of web browsers from 2009 to November 2020 according to StatCounter