Some reasons: - Ad blocking - Reporting analytics to home base for product feedback - Mocking network requests to make certain pages load faster. - Performa

Some reasons: - Ad blocking - Reporting analytics to home base for product feedback - Mocking network requests to make certain pages load faster. - Performance analytics for the page's network (like the devtools). Please remember that some extensions are not free, we companies like Microsoft paying a substantial amount of money for the extension we develop (Testim Editor) for example.