Organize Downloads by Month is a free Chrome add-on developed by paulpark03. This add-on automatically organizes downloads inside the default download location into sub-directories labeled by year and month.

With this add-on, you can easily keep track of your downloaded files by organizing them in a structured manner. The add-on works by setting the "Download location" in the Advanced Settings and then downloading any file. The downloaded files will be automatically placed in sub-directories based on the year and month of the download.

For example, if you download a file named "helloworld.txt" on June 11, 2014, and your default Download location is set to "C:\Users\Paul\Downloads", then you would find the downloaded file at "C:\Users\Paul\Downloads\\helloworld.txt".

It's worth noting that this add-on is compatible with Saft Extension's Sort Download by Date function on Safari. The script used in this add-on is based on the download_filename_controller sample extension, ensuring reliability and efficiency.