For non-Premium users, our payment page displays when we update the extension to keep you informed on changes we've made and as a reminder to consider upgrading to Premium. There is no obligation to upgrade and you can dismiss the page by clicking the "x" on the browser tab. The payment page should only appear once every two weeks. If you are seeing the page more frequent than that, please submit a support request and we'll be happy to assist you: https://help.adblockplus.org/hc/en-us/requests/new.