User blog comment:Harbumz/Introducing Vignette, Wikia's New Thumbnailer/@comment-1251315-20150212153753/@comment-452-20150222141211

Sorry I missed your reply earlier.

Replacing that image works exactly the same. $(".AccountNavigation .account-navigation-first-item .avatar-container .avatar-container .avatar").attr("src", $(".AccountNavigation .account-navigation-first-item .avatar-container .avatar-container .avatar").attr("src").replace("/50", "/100")); And requires these additional steps to set the dimensions: $(".AccountNavigation .account-navigation-first-item .avatar-container .avatar").attr("height",100); $(".AccountNavigation .account-navigation-first-item .avatar-container .avatar").attr("width",100); $(".AccountNavigation .account-navigation-first-item .avatar-container").css("height",100); $(".AccountNavigation .account-navigation-first-item .avatar-container").css("width",100);