fangraphsPlayerNameHider.user.js

// ==UserScript==
// @name 	FanGraphs Player Name Hider
// @namespace 	http://joshwilson.net/gmscripts
// @author      jw@joshwilson.net
// @include     http://www.fangraphs.com/leaders.aspx*
// @grant       none
// @version     1.0
// ==/UserScript==

///////////////////////////////////////////////////////////////////////////////
/**
 * Hides player names and teams on FanGraphs leaderboards so you can assess stats
 * without name-recognition influences. You can click to reveal and or all names.
 */

//Grab all the data rows, hide the player name and team in each
var allRows = new Array(2);
allRows[0] = document.getElementsByClassName("rgRow");
allRows[1] = document.getElementsByClassName("rgAltRow");

var nameNode, teamNode;
var idCounter=1;

for (var i=0; i<allRows.length; i++) {
  for (var n=0; n<allRows[i].length; n++) {
    try {
      nameNode = allRows[i][n].childNodes[2];
      teamNode = allRows[i][n].childNodes[3];   
      newNameElem = makeFanGraphsLeadersElem("name", nameNode.textContent, idCounter);
      newTeamElem = makeFanGraphsLeadersElem("team", teamNode.textContent, idCounter);
      allRows[i][n].replaceChild(newNameElem, nameNode);
      allRows[i][n].replaceChild(newTeamElem, teamNode);
      idCounter++;

    } catch(e) {}
  }
}

//Add a link to reveal all data
var displayElem = document.getElementsByClassName("br_dby");
var revealAllElem = document.createElement("span");
revealAllElem.setAttribute("onclick", "try{var hiddenElems=document.getElementsByClassName('hidden-data');for (e in hiddenElems){hiddenElems[e].textContent=hiddenElems[e].getAttribute('actual-data')};}catch(err){}");
revealAllElem.appendChild(document.createTextNode(" | Reveal All Data (click individual names/teams to reveal)"));
displayElem[0].childNodes[1].appendChild(revealAllElem);


//Creates the hidden data elements
function makeFanGraphsLeadersElem(uid, data, idCounter) {  
  var newElem = document.createElement("td");
    newElem.setAttribute("class","grid_line_regular");
  var revealElem = document.createElement("span");  
    revealElem.setAttribute("id", "hidden-" + uid + "-" + idCounter);
    revealElem.setAttribute("class", "hidden-data");
    revealElem.setAttribute("actual-data", data);
    revealElem.setAttribute("onclick", "this.textContent='" + data + "'");
    revealElem.appendChild(document.createTextNode("CLICK TO REVEAL"));
  newElem.appendChild(revealElem);   
  return newElem;
}

Never be biased again! Hides player names and teams on FanGraphs leaderboards so you can assess stats without being influenced by name recognition. You can click to reveal individual names/teams, or use the "Reveal All Data" link to see all the names again.

Hey, look a screenshot! https://www.dropbox.com/s/9qw86mrp5jw0hhl/fangraphs_name_hider.jpg?dl=0

This is a user script for GreaseMonkey (Firefox) or Tampermonkey (Chrome) (I have not tested GreaseKit for Safari, but I understand that works the same). To use it, install GreaseMonkey or Tampermonkey, then click the "Raw" button above and confirm to install.

Quick and dirty work done here, I'm happy to hear suggestions on functionality.