Here is a script for Downloading and automatically renaming Fantia files, to remove the first 9 characters. I.E for this: a4afad21_20250730_百〇あ〇め_足コキ.mp4 -> it would remove everything before 20250730 like the annoying ID Fantia adds to every video, resulting in 20250730_百〇あ〇め_足コキ.mp4. It is a tampermonkey script and I think it works with alternatives to that as well. You can modify the color of the download button and progress indicator if you want as well, by default it is set to pink. I am giving both the js file and raw text file, all you would need to do is import the .js file or simply create a new user script, copy and paste, then go to File->Save and make sure it is on. Works in Firefox, did not test in chrome, but it should work. And yes, I promise, no malware, you can check the script yourself.
