How to download from multiple download links at once

I have firefox and chrome both with the newest versions. I am a manga reader as well and want to download every chapter of Hanma Baki after the "Netflix" 2018 baki that was released this month. So there are over 300 Chapters and way to many to click each one and download them one at a time if I don't have to.

So here is the question is there a way to download all them at once. Here is what is available to me.

I go to this specific site and I see Chapter and then the name of the chapter and then the word download. I can click download and then the download starts. But I always make sure the arrow flashes first to make sure the download started. Because if I click download on more then 5 at once I don't know if each one started.

Is there away to start the download for all 300+ at once and have only 5 download and then when the 5 drops to 4 another one starts from the list.

Is this even possible if so how. Is there a addon or something I can do to get this to work if possible.

You probably want a Download Manager -

Best free download manager 2020 | TechRadar

A download manager was just what I needed. I found a good Firefox addon called downthemall! which dose the trick for what I need it for at lease this way I know the downloads are running without needing to keep opening the downloads arrow to make sure.