Read all of HackneyHipsterHate.tumblr.com inline (without having to click through for the posts). Probably works for other tumblrs too.

loadAllPosts.bookmarklet.js

void function(){[].forEach.call(document.querySelectorAll('.read_more'),function(a){var x=new XMLHttpRequest();x.onload=function(){a.outerHTML=this.responseText.split('<!-- more -->')[1].split('<div class="footer')[0]};x.open('get',a.href,true);x.send()})}();

loadAllPosts.js

void function loadAllPosts(){
  [].forEach.call(document.querySelectorAll('.read_more'), function ajaxThis(link){
		var ajax = new XMLHttpRequest();

		ajax.onload = function injectContent(){
			link.outerHTML = this.responseText.split('<!-- more -->')[1].split('<div class="footer')[0];
		};

		ajax.open('get', link.href, true);
		ajax.send();
	});
}();