As far as I know, Orion is the only iOS compatible browser that lets you load extensions from the Chrome store and possibly Firefox as well although I'm not sure about that.
Parent is probably referring to the saga of extension support in FF for Android (it used to support all extensions until around 2019, then it didn't [0], then it did again but only a small number of extensions [1], they only recently got back to supporting a large number, but not all extensions [2])