Avast Secure Browser - www.avast.com/secure-browser
Avast Secure Browser is basically a Chrome clone with a bunch of extensions installed for greater security from Avast. The install offers a few options but no other bundled software. On the first screen under the big green ACCEPT AND INSTALL button click on the word Options.
You can choose language, Import data from:, to launch browser after install, or the most important one - Make Avast Secure Browser my new default browser. I did not check that one. The others concern shortcuts - your choice.
So I wanted to check out the extensions installed first. So I clicked on the setting button. Three stacked dots top right hand corner. Then go to More Tools, then Extensions.
But it showed just a blank page and claimed no extensions installed. It was just a matter of clicking off that switch in the top right hand corner that is labeled Developer mode. Now you can disable or enable extensions as you see fit.
So I went to Youtube to test out the downloader. I picked this one at random: https://www.youtube.com/watch?v=4QDsqWkUvXQ . To download hover your mouse cursor over the video, you can pause it if you want, and a green download option will appear on the top right hand corner of the video.
You can click on Download and start the download immediately. Or click on the upside down triangle to get a few more options. You can change the resolution if available, or choose Audio. The last settings button doesn't seem to offer much.
There is a second way to download and that is to click on the camera extension icon at the top right of the browser. The video and audio options are hidden at first so just click on the little triangle button on the right side of the download button. The downloads automatically go into your download folder.
Just a note the audio format defaults to .m4a with no option to change it.