EDIT:
RIP Oleksandr, you and your add-ons will be missed. :(
******
I hope the developer is ok. Just to let him know that Download Manager (S3) is breaking virustotal.com. For some reason the addon doesn't let me upload files to the site and the site triggers the captcha. After solving the captcha, the cycle repeat. Try to upload -> captcha->try to upload-captcha. Turning the addon off fixes the problem.

Queue is broken. You tell it to download 1 file at a time, then paste in 99 links, and it starts to download ALLLLLL of them. wtf?! It hits pause on every one as soon as it starts though, and randomly one will slip thru and start downloading completely. Often 2 are downloading at the same time. VERY broke feature. WTH can't it just actually QUEUE up what it downloads and just download 1 at a time? disappointed. lack of a lot of settings that would be super handy (like default download path).

how do you switch on queue mode

non-modern appearance and Checksum not work

Recently migrated from Chrome so this plugin seemed like a perfect solution to get Chrome-like download management, but after a few days I noticed Firefox' WebExtensions process was eating 7.5gb memory! Disabled this plugin and it's dropped to just 43mb. Clearly a memory leak in the code somewhere unfortunately.

Needs choice where to leave the download (temp. directory, default directory, etc). In particular, I want to get rid of downloaded, processed, Archives (rar, zip, etc) without taking further action.

Unfortunately, there is no function to download links in a selected fragment of a web page or on the entire web page, with filtering by extensions. There is no way to save a link to the original location of the file in descript.ion. Or better yet, a description of the downloaded file added by the user.

Very useful except for one big flaw: no option to disable the confirmation window when you open a file. I clicked on it, yes I want to open it, you don't need to waste my time with a pop-up window.

我不喜欢每次下载出现的横条

Looks good but I was expecting this addon to preserve download modification timestamp :/

Era excelente, pero empezó a consumir muchos recursos, más en descargas múltiples (5 o más). A veces desaparecía la barra inferior y reaparecía de la nada. Se han producido varias actualizaciones, pero ninguna ha solucionado eso. La he deshabilitado hasta que vuelvan a lo que eran, sino la eliminaré

A good addon, but you're using a pre-existing Firefox Shortcut for one of your Addon Shortcuts.

CTRL+SHIFT+Z, which you have set to show and hide the download bar (a rather important function) is already the shortcut for Show/Hide Console in Firefox.

not launches a file by double-clicking in the associated program, not a photo not a text

1. Кб и Мб - это килобит и мегабит. Для байтов правильно КБ и МБ. А если уж совсем дотошно, то для 2^10 используется формат "киби" (КиБ И МиБ). 2. Когда закачка обрывается, в окне истории и в панели ctrl+shift+z пишет "файл не найден". После возобновления закачки (через родной менеджер ff) список обновляется, но в панели продолжает висеть потерянный файл.

It seems to work quite well. It lets you control evey aspect of the appearance except changing or disabling the black borders.

apenas estoy iniciando

Как оказалось расширение блокирует контент на страницах некоторых сайтов. То есть на страницах не открывается содержимое. Жаль,пользовался давно и вынужден отказаться.

Bien détaillé et fait son boulot correctement, cependant, je constate qu'il consomme beaucoup de ressource machine (CPU 45% POUR FIREFOX, EN ALERTE AVEC BIP SONORE DE SURCHAUFFE), donc 1 étoile en moins.
De plus, je constate qu'il ne permet pas de contrôler la manière dont le fichier doit être gérer (ouverture du lien ou enregistrement). La case "Toujours effectuer cette action pour ce type de fichier" est toujours grise, et je comptais sur lui pour me permettre de la dé-griser (de garder en mémoire l'action a entreprendre en fonction du type de fichier).

Nice to have, handy! Good to have both the download bar and the download list in toolbar, good idea.
I notice few glitches:
- the text color of the d/l speed and estimated time in each download element does not respect the text color in settings.
- the size of the download history window is not remembered, you have to re-size it every time.
- when disabled gradients in settings, buttons still use gradients.