An update to an old bookmarklet I found. It scours a page for links to images and creates a new page with the (non-thumb) version of those images. Now compatible with webm. Works great for popular image boards.

imagePage.bookmarklet.js

javascript:(function(){function I(u){var t=u.split('.'),e=t[t.length-1].toLowerCase();return{gif:1,jpg:1,jpeg:1,png:1,mng:1,webm:1,} [e]} function J(f){if((f.indexOf('thumbs')==-1)&&(f.indexOf("t.4cdn")==-1)){return 1;}else{return 0;}} function hE(s){return s.replace(/&/g,'&').replace(/>/g,'>').replace(/</g,'<').replace(/"/g,'"');} function wrap(href){var t=href.split('.'),e=t[t.length-1].toLowerCase(),s='<p>'+q.innerHTML+' ('+hE(h)+') <br/>';if({webm:1}[e]){s+='<video controls="" loop="" src="'+hE(h)+'" style="max-width: 1280px; max-height: 720px;"></video>';} else{s+='<img style="max-height:690" src="'+hE(h)+'">';} s+='<hr/>';return s;} var q,h,i,z=open().document;z.title="images from "+location.href;z.write('<p>Images linked to by '+hE(location.href)+':</p><hr>');for(i=0;q=document.links[i];++i){h=q.href;if(h&&I(h)&&J(q.innerHTML)) z.write(wrap(h));} z.close();})()

imagePage.cleartext.js

/* this is a nasty hairball of code that is meant to be minified and ran as a bookmarklet. */

javascript : (function () {
	
/* 	returns true if a url is a valid image */
	function isImage(u) {
		var t = u.split('.'),
		e = t[t.length - 1].toLowerCase();
		return {
			gif : 1,
			jpg : 1,
			jpeg : 1,
			png : 1,
			mng : 1,
			webm : 1,
		}
		[e] /* ugly hack*/
	}
	
/* 	returns true if the image does not appear to be a thumbnail
	Uses a hueristic. */
	function isNotThumbnail(f) {
		if ((f.indexOf('thumbs') == -1) && (f.indexOf("t.4cdn") == -1)) {
			return 1;
		} else {
			return 0;
		}
	}
	
	/* returns a string that contains fixes for some issues with the href we get from the url */
	function humanReadableHref(s) {
		return s.replace(/&/g, '&').replace(/>/g, '>').replace(/</g, '<').replace(/"/g, '"');
	}
	
	/* returns a string that is the correct html tag to show the image/webm */
	function wrap(href) {
		var t = href.split('.'),
		e = t[t.length - 1].toLowerCase(),
		s = '<p>' + currentLink.innerHTML + ' (' + humanReadableHref(currentLinkHref) + ') <br/>';
		if ({ webm : 1}[e]) { /* ugly hack*/
			s += '<video controls="" loop="" src="' + humanReadableHref(currentLinkHref) + '" style="max-width: 1280px; max-height: 720px;"></video>';
		} else {
			s += '<img style="max-height:690" src="' + humanReadableHref(currentLinkHref) + '">';
		}
		s += '<hr/>';
		return s;
	}
	
	/* main*/
	var currentLink,
	currentLinkHref,
	i,
	newDocument = open().document;
	
	newDocument.title = "images from " + location.href;
	newDocument.write('<p>Images linked to by ' + humanReadableHref(location.href) + ':</p><hr>');
	
	/* for each link in the page, 
	inspect it to see if it is an image, 
		and write out the appropriate tag */
	for (i = 0; currentLink = document.links[i]; ++i) {
		currentLinkHref = currentLink.href;
		if (currentLinkHref && isImage(currentLinkHref) && isNotThumbnail(currentLink.innerHTML))
			newDocument.write(wrap(currentLinkHref));
	}
	
	newDocument.close();
})()

imagePage.js

javascript : (function () {
	function I(u) {
		var t = u.split('.'),
		e = t[t.length - 1].toLowerCase();
		return {
			gif : 1,
			jpg : 1,
			jpeg : 1,
			png : 1,
			mng : 1,
			webm : 1,
		}
		[e]
	}
	function J(f) {
		if ((f.indexOf('thumbs') == -1) && (f.indexOf("t.4cdn") == -1)) {
			return 1;
		} else {
			return 0;
		}
	}
	function hE(s) {
		return s.replace(/&/g, '&').replace(/>/g, '>').replace(/</g, '<').replace(/"/g, '"');
	}
	function wrap(href) {
		var t = href.split('.'),
		e = t[t.length - 1].toLowerCase(),
		s = '<p>' + q.innerHTML + ' (' + hE(h) + ') <br/>';
		if ({
			webm : 1
		}
			[e]) {
			s += '<video controls="" loop="" src="' + hE(h) + '" style="max-width: 1280px; max-height: 720px;"></video>';
		} else {
			s += '<img style="max-height:690" src="' + hE(h) + '">';
		}
		s += '<hr/>';
		return s;
	}
	var q,
	h,
	i,
	z = open().document;
	z.title = "images from " + location.href;
	z.write('<p>Images linked to by ' + hE(location.href) + ':</p><hr>');
	for (i = 0; q = document.links[i]; ++i) {
		h = q.href;
		if (h && I(h) && J(q.innerHTML))
			z.write(wrap(h));
	}
	z.close();
})()