AdBlock is free software supported by donations from happy users. We populate our donation page twice a year, once in the spring and once in the fall, as a reminder to donate to AdBlock if you find the software beneficial. It also appears with each installation of AdBlock. There is no obligation to pay and you are welcome to close the donation page by clicking the "x" on the tab if you've already donated or prefer not to donate. Reach out to us at help@getadblock.com with any questions! --AdBlock Support