Fucking up perfectly good iMacs with fucking OS updates

I have an old fucking iMac 2007. I can’t update to the fucking new OS anymore, nor do I want to. I am stuck with that fucking Mountain Lion violence. (I know I have fucking Snow Leopard somewhere) Problem is, my fucking web browsers are no longer supported and it’s starting to cause fucking grief for me. Any fucking outs available? The machine still runs fucking great. fucking thanks