FireFox: DownThemAll[Add-on]

Hello to everyone, I'm here to ask for help in solving my problem with an add-on in FireFox..



So my problem is whenever I try to ddl something from kissanime and check to see progress on the add-on tab there would always be this 403 or 404 error that shows up in the progress bar. I did a bit of searching and came to know that 403 and 404 error only shows when I'm restricted from the site or if the download link is missing but I was neither restricted to kissanime nor the download link was missing, I tried using the built-in downloader of FireFox and there was no problem with the download.



Oh yeah, I don't know if IDM has something to do with it but when I finished installing the IDM the problem started.



Thanks in Advance.



PS, I want to use the downloader because it has a resumable capability even after the pc is shut down.

FireFox: DownThemAll[Add-on]