Go to the Mozilla Add-ons Web Page {web link} (There’s a lot of good stuff here) and search for a downloader.

There are also external downloaders available, separate from Firefox.

I did that. I found many downloaders. The problem seems to be that this "Rumble" site is HTTPS and HTTP only is supported by several downloaders. Which downloader will do HTTPS without trying all of them?

I just found the video from rumble also on youtube. Problem solved.

You must read the descriptions. Some will have support site information on the add-ons page. Ask questions.

Thank you.