code: private BrowserUsageData getFirefoxUsageData() {
      BrowserUsageData data = new BrowserUsageData();
      data
          .setBrowserName("Firefox");
      data
          .setMarketShare(21.63f);
      ColorReference ffColor = new HighchartsColor(1);
      data
          .setColor(ffColor);
      data
          .getVersionUsageData()
          .add(new VersionUsageData("Firefox 2.0", 0.20f, ffColor.brighten(0.1f)));
      data
          .getVersionUsageData()
          .add(new VersionUsageData("Firefox 3.0", 0.83f, ffColor.brighten(0.2f)));
      data
          .getVersionUsageData()
          .add(new VersionUsageData("Firefox 3.5", 1.58f, ffColor.brighten(0.3f)));
      data
          .getVersionUsageData()
          .add(
              new VersionUsageData("Firefox 3.6", 13.12f, ffColor
                  .brighten(0.4f)));
      data
          .getVersionUsageData()
          .add(new VersionUsageData("Firefox 4.0", 5.43f, ffColor.brighten(0.5f)));
      return data;
    }
docs: Creates the Firefox data.