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CMS Crawler identifies which publishing solutions that different sites use. Every day we visit hundreds of thousands of websites and try to determine which tool is used. We are looking for everything from simple file-based systems to the largest ECM, CMS and e-commerce solutions.
if you block Firefox 3 you _will_ be blocking many Linux users. I run a "bleeding edge" testing release of Debian. Debian stable is still based on Firefox 3 and probably will be for at least another year. The current stable versions of Ubuntu is also based on Firefox 3, and the next stable version is not expected for several months. Once it comes out, companies will typically wait 1-6 months to upgrade. There are linux users who value stability over new features. Firefox 4 is still less than a year old. Generally, stable releases of Linux will persist 3-5 years.
Mozilla/5.0 (Windows NT 5.1; rv:10.0) Gecko/20100101 Firefox/10.0