Shield/Trade with Firefox?

is it possible to shield coins with firefox and not the app. I know of lightshadowbox but it seems to be only chrome. I also know of but it seems to only allow trading of shielded coins once they are already shielded. How can I get shielded coins? Is it possible through metamask? I also saw That seems to allow trading of non-shielded coins with each other and prv. Is there a way for me to shield my coins on there. or to purchase already shielded coins on a dex. Is prv just as private as a shielded coin? If so, I could purchase prv through and then trade back to btc later. But it would be easier to be able to shield my own btc and not worry about price swings.