AMO: Randomize Contribute Button

Randomize 'Contribute' button on Mozilla Add-ons
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/*
    Randomize 'Contribute' button on Mozilla Add-ons
    Copyright (C) 2012 LouCypher

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program. If not, see <http://www.gnu.org/licenses/>
*/

// ==UserScript==
// @name          AMO: Randomize Contribute Button
// @namespace     http://userstyles.org/users/12
// @description   Randomize 'Contribute' button on Mozilla Add-ons
// @version       1.1
// @author        LouCypher
// @license       GPL
// @include       https://addons.mozilla.org/*
// @grant         GM_addStyle
// ==/UserScript==

var contributt = document.getElementById("contribute-button");
if (contributt) {

  var things = [
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    },

    { name: "coffee",
      icon: "data:image/png;base64,\
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    },

    { name: "beer",
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    },

    { name: "donut",
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    },

    { name: "hamburger",
      icon: "data:image/png;base64,\
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      pos: "center center"
    },

    { name: "car",
      icon: "data:image/png;base64,\
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      pos: "bottom center",
      margin: "6px"
    }
  ]

  var num = parseInt(Math.random() * things.length);
  contributt.innerHTML = "<b></b>Buy me a " + things[num].name;
  GM_addStyle(".button.contribute.prominent b {\n"
            + "  background-image: url('" + things[num].icon + "');\n"
            + "  background-position: "
            + (things[num].pos ? things[num].pos : "center 2px") + ";\n"
            + "  margin-right: "
            + (things[num].margin ? things[num].margin : "0") + ";\n"
            + "}")
}