Overall great work, the interface is very nice. After a little finagling it works well and does what it supposed to do, but with a couple of minor issues.

The "name" and "ext" scripts in the file renaming could use a couple of tweaks. It doesn't recognize the extension correctly when saving if there is a period within the file name. It just assumes everything to the right of the first period is the extension, and cuts off/truncates the actual extension at the next period. I just used it on a large collection Band-In-A-Box song files (https://www.bensax.nl/biab) that had many such files. I ended up just creating the desired sub-folder and setting it as default temporarily instead of using the file renaming function to avoid having it scramble the file names and extensions.

I found also that it fails to download selected files that contain non-English characters (ex: TÖRNFÅGL.MGU). In the link above it skipped all such files and several others, almost all of the others contained punctuation of some sort, ~ ' !, etc. They all downloaded fine when I went back through the Firefox download history and clicked the retry button. Just something to check into.

Would also be nice if the custom file extensions would support wildcard characters "?" and/or "*". The link noted above has 7k+ similar files that use about 35-40 similar but different extensions. I realize this is not a typical scenario, but simply adding "MG?" vs. adding each extension individually would have been very handy.

Very useful to download 1000 Nokia ringtones off an FTP website in just a few clicks.

Works OK. Crashes if you try to download multiple images with the same filename. Would be better if it worked in its own tab.

The popup windows doesn't appear on Mac

It "sort of" works, but don't pin it to the Overflow Menu, because the app depends upon an ENORMOUS amount of space to display its UI. :-(

This is best Add ons ever in my Life.

Fantastic Tool that's saved me hours of bulk downloading.

Sadly lacks the support of one specific video container, which a ton of sites have switched to in the recent years: Transport Stream, also known as TS files.
Used many places now because of the better and stable support in many browsers.

ឡេ ធា រី

Works like a charm! AND more importantly, it doesn't require access to EVERYTHING (which is unlike most of the mass file download addons I saw). Thank you for only doing what was needed and not making an addon that gains access to your entire life. :)