Cleaning up the presentation of the counter in Linux for FF29+

Sorry about this not landing before you closed issue #187.

Here's the screenshots of the before-and-after:

Before | After
---------|-------
![1-char-before](https://cloud.githubusercontent.com/assets/70704/2715245/ae48f4f8-c507-11e3-95e3-1e650eafa8ca.png) | ![1-char-after](https://cloud.githubusercontent.com/assets/70704/2715240/ae45d3fe-c507-11e3-98f4-a094e36ea235.png)
![2-char-before](https://cloud.githubusercontent.com/assets/70704/2715242/ae4830fe-c507-11e3-87b1-fe3c3c4fb0fc.png) | ![2-char-after](https://cloud.githubusercontent.com/assets/70704/2715244/ae48cf46-c507-11e3-995a-4ab1dd64f9f4.png)
![3-char-before](https://cloud.githubusercontent.com/assets/70704/2715241/ae47c2cc-c507-11e3-9f5e-3d5cc3ffa288.png) | ![3-char-after](https://cloud.githubusercontent.com/assets/70704/2715243/ae488f5e-c507-11e3-8be5-9052ee698dd9.png)
![4-char-before](https://cloud.githubusercontent.com/assets/70704/2715247/ae541d56-c507-11e3-8727-2d6adf612060.png) | ![4-char-after](https://cloud.githubusercontent.com/assets/70704/2715246/ae50b940-c507-11e3-83f0-165b01e62ddb.png)

Hope you're happy with the change!