This is an iPhone. Firefox is just safari with a different skin on iOS. I’d recommend stick with safari but use the free Adguard extension for iOS. It’s owned by a commercial company, but it’s open source, performative and has the ability to use many of the same filters ublock uses
All browsers on ios use the safari engine with a different interface. Firefox extensions are made for the Gecko engine and thats why FF extensions won't work on ios.