Via uses chromium for the WebUSB api which firefox didnt implement because its a security nightmare. Vial is not as polished but is an open source standalone software

Red/brown/etc originate from Cherry MX switches (the style of keyswitch) and each color is a different kind of swotch with different tactile feel and sound. Red are linear. Imagine a mushy rubber button with no feedback. Brown has a tactile bump that is more typical of a keyboard where theres a bit of force before it actually actuates. I settled on holy pandas for now which were similar to browns but a stronger tactile feel.

I'm not 100% sure how good it is but as long as you read reviews to understand what the shortcomings and strengths of the board are, most keyboards should be fine. From what I've seen in a quick google search, this particular keyboard is probably ok, but some people have reported this company's keyboards randomly dying and little to no support. Reputable brands will obviously guarantee no funny business but with the tradeoff of cost. I would recommend joining some communities (e.g. the discord communities like MechGroupBuys) and asking around for more peoples experience with budget keyboards if the cost is a concern.

My suggestion is to get a keyboard with the features you want, then the keycaps you want. Then you can experiment with small switch sets to find one you like. Search for Outemu switches on Ali Express, they have very ~~adorable~~ affordable packs of 10. If you’re unsure whether you’d like a linear, tactile or clicky, get one from each at least. Get both regular and silent versions of tactile to try out. I really like the Silent Lemon tactile V3. People rave about the Panda.

Note that keycap material and to a lesser degree geometry will affect the sound too. You can also add o-rings to the caps to decrease high frequency sounds.

Edit: adorable/affordable. Autocorrupt made a funny.