かんたんCSVダウンロード is a free Chrome add-on developed by 音水. It falls under the category of Browsers and is specifically categorized as an Add-ons & Tools. This add-on allows users to download detailed information about their Yahoo!かんたん決済 payments in CSV format.

To download the payment details, users need to navigate to the desired month in the payment list and right-click on the page. They should then click on "Yahoo!かんたん決済支払い一覧CSVダウンロード" to initiate the download. It is important to note that the time taken for the download to start will depend on the number of items in the list.

Users can monitor the progress of the download by accessing the console using the F12 key.