with chromium or google chrome, in other words not 'IRON' version, the disk chacheing for youtube video streaming happens on the C: drive, even if the browser is installed on another drive, so using Iron fixed that, to make the cacheing happen on the other drive instead. This is to reduce wear on the C: drive, which in my case is a SSD. Now firefox seems to have the cacheing eliminated, so the video streams using the memory alone, the RAM.
I believe edge uses the C: drive to cache. I've not tested in a while since before I switched to Firefox recently, but EDGE is goofy enough without this issue to cause me to want to use another browser anyway.
I don't have any other 'windows 10 devices', besides my main gaming desktop pc, so I suppose I wouldn't be bothered to block the installation, as edge doesn't really take up much space, and is 'good enough' for use as the default browser, which microsoft seems to rather demand, in the way i've mentioned. I'm using edge now, as the link was from the mail client to open this website. It does this well enough.
If I could find a mail client that has the option to open the web links using a different browser, other than the 'default' browser in windows settings, I would like to switch to that for my main mail client. I seem to recall that this was a feature of thunderbird but because of an addon or extension.
Any way, just wanted to clarify my reasoning for using edge and also iron and firefox. I haven't tested edge to see if it is still using the disk cacheing for video streaming or not. I also haven't bothered to test chromium or google chrome lately, being satisfied with iron and now firefox. Though firefox is a bit slower to open the pages.
Also, sometimes firefox will reload the page when I click on a reply link in a youtube comment, but sometimes it doesn't.