Yeah, I will have to change that. It is like that, because to insert the "duration tag", we need to decode the entire video first and, for long videos, that's obviously going to take a while (or crash).

I recommend that you open the video in preview, and save it from there (with right click -> save video as).

EDIT: this should be "fixed". It will give you an error message, but you will be able to download the file, although it will not have the duration metadata.

I will add an indicator for "no media found on website," sometime, once I next update this.

Make sure the video/audio is playing when you click the button, or otherwise it's probably a bug on a specific website.

Interesting... Did you try opening the preview and downloading it via that? Sounds like that might be an issue with larger files.

You should see the small status bar thingy. I might rework the UI to use the add-on popup one day, because the current one is buggy. Try again once that happens. (not sure when)

The recorder is still experimental tech from Mozilla, and constantly evolving. The UI is a bit difficult to keep consistent on all websites, since they all have their quirks.

If people would leave information like which websites they meet these difficulties on, so I could troubleshoot, then that would be helpful.

Some info on how it's not working would help improve this addon in the long run.