TfsWebCompact neatens up the look-and-feel of your TFS web backlog and task board. See also http://www.szalapski.com/2014/05/a-compact-layout-for-tfs-web-work-items.html .

TfsWebCompact.bookmarklet.js

/* The following is a bookmarklet.  For it to work, you need to convert all whitespace to "%20", 
	then invoke it from a bookmark in your browser. 
	To actually use it, it is easier to drag-and-drop starting with my blog post:
	http://www.szalapski.com/2014/05/a-compact-layout-for-tfs-web-work-items.html */
javascript: /*TfsWebCompact bookmarklet 2.3 by Szalapski.com. For TFS 2015 task board, story board, and backlog.*/ 
(function TfsWebCompact(){ 
	function addStyle(selector, styles){ addCss(selector + '{' + styles + '}'); }
	function addCss(css){ jQuery('html > head').append(jQuery('<style>' + css + '</style>')); }
	(function tightenUpBoard(){ 
		jQuery('.taskboard').css('left','0');
		jQuery('.taskboard .taskboardTableHeaderScrollContainer.nonScrollable').css('top','-9px');
		jQuery('.taskboard .taskboardTableBodyScrollContainer.scrollable').css('top','15px');
		jQuery('th.taskboard-cell').css('padding','0 inherit');
		jQuery('.taskboard-cell').css('padding-left','0');
		jQuery('.taskboard-row-summary .taskboard-cell').css('padding-top','0');
		jQuery('.taskboard-row-summary .taskboard-cell .tbPivotItem').css('margin-bottom','0');
		jQuery('td[axis="taskboard-table-body_s0"].taskboard-cell').css({'padding-bottom':'28px'}); 
		jQuery('.taskboard-cell .board-add-card').css('margin', '0');
		jQuery('.add-task-container').css('padding', '0');
	})();
	
	(function tightenUpBacklog(){ 
		var css = `
			#header-row {display: none;}
			.header-section .hubs-section {left:300px; top:-5px;}
			.nav-separated .hub-groups-section, .nav-separated .search-box {margin-top:0; padding-top:0;}
			.header-post11 .hub-groups-section li {margin-bottom:0; padding-bottom:0;}
			.header-post11 #navWrapper {height:20px;}
			.header-post11 + .content-section {top:20px;}
			.header-post11 .hub-groups-section {padding-bottom: 0;} 
			.hub-title {padding-top:9px; padding-bottom:9px;}
			.hub-content .right-hub-content .hub-pivot { margin-left:300px; margin-right:340px;}
			.hub-view.explorer .right-hub-content {top:3px;}
			.backlog-header .toolbar .menu-bar > .menu-item{margin-top:0; margin-bottom:0; padding-top:0; padding-bottom:0; }
			.backlog-header .toolbar .menu-bar > .menu-item.text-filter-box {margin-top: 0 !important;}
			.backlog-header .toolbar .menu-bar > .menu-item.toggle-filter-bar {padding-bottom:0; padding-top: 0 !important;}
			.backlog-header .toolbar .menu-bar > .menu-item.toggle {margin-top: 0 !important;}
			.backlog-header .toolbar { height:25px; margin-bottom:0;}
			.backlog-header { height:auto; margin-bottom:0;}
			.productbacklog-grid-results.sprint-backlog.grid {margin-top:0;}
			.grid-focus {height: 0;}
			.grid-header-column > .title {padding-top: 0; }
			.grid-row.closed-item-tfsWebCompact {color:green;}
			.grid-row.closed-item-tfsWebCompact .grid-cell:nth-child(3) {text-decoration:line-through;}
		`;
		addCss(css);

		function markCompletedRows(){
			var completedRows = jQuery('.grid-row:has(.grid-cell:contains(Closed)),.grid-row:has(.grid-cell:contains(Resolved))');
			completedRows.addClass('closed-item-tfsWebCompact');
		};
		function fireOnDomChange(nodeToObserve, callback){
			new MutationObserver(callback).observe(nodeToObserve, {childList:true});
		};
		var mainGridNode = jQuery('.backlog .grid-canvas')[0] && fireOnDomChange(mainGridNode, markCompletedRows);
	})();
	
 	(function twiddleExpanders(){ 
		jQuery('.taskboard-content-row').each(function(index, element){ 
			var item=jQuery(element).children("td[axis='taskboard-table-body_s0'],td[axis='taskboard-table-body_s1']");
			if(!item.find('.tbTile')[0]){ jQuery(element).children(".taskboard-expander")[0].click(); } 
		});
		jQuery('.taskboard-row.taskboard-row-summary .witTitle').each(function(index, element) { 
			jQuery(element).css({'font-size':'smaller'});
		});
	})();
	
	(function tightenUpTiles(){ 
		jQuery('.tbTile.parentTbTile').css('width','140px');
		jQuery('.taskboard-parent').css({'min-width':'auto','width':'140px','padding-right':'0'});
		jQuery('.taskboardTableHeaderScrollContainer .taskboard-parent').css({'min-width':'146px','width':'140px','padding-right':'0'});
		jQuery('.additional-field.lastAdditionalField').css({'margin-bottom':'0'});
		jQuery('.taskboard-cell .id-title-container').css({'margin':'0','padding-right':'0'});
		jQuery('.taskboard-cell .witExtra').css('margin','0 0 3px 0');
		jQuery('.tbTile').css('margin','0 0 5px 5px');
		jQuery('td[axis="taskboard-table-body_s2"] .tbTile').css({'font-size':'9px'});
		jQuery('td[axis="taskboard-table-body_s2"] .tbTile .id').css({'line-height':'10px'});
		jQuery('td[axis="taskboard-table-body_s2"] .tbTile .title').css({'line-height':'10px'});
		jQuery('td[axis="taskboard-table-body_s2"] .witExtra').css('display', 'none');
		
		var css = `
			.id-title-container,
			.board-content-details .task-list .add-task-container,
			.agile-board .board-tile .board-tile-content .child-tasks-summary, 
			.board-content-details .task-list .task,
			.tags.field-container,
			.additional-field.lastAdditionalField,
			.board-tile .container
			{ margin:0 }
			
			.add-task-container {padding:0;}
		`;
		addCss(css);
		
		jQuery('.field-container.additional-field:contains("State Change Date")').css({'margin-top': '-20px', 'position':'relative'});
		jQuery('.field-container.additional-field .field-label:contains("State Change Date")').hide();
		jQuery('.field-container.additional-field:contains("State Change Date") .field-inner-element').css({'right': '-76px', 'position':'absolute', 'background-color': 'white'});
		jQuery('.field-container.additional-field:contains("State Change Date") .field-inner-element').text(function chopOffYear() {var value = $(this).text(); return value.length<8 ? value :value.substr(0, value.length-5);});
	})();
	window.dispatchEvent(new Event('resize'));
})();

Easier to use if you start from the blog post.