If you are still using Internet Explorer First of all, you should dump it as soon as possible. Firefox is due to include: security, tabbed navigation, the possibility of customization and useful extension.
The fact that bloggers are very convenient for the extension, there are many. ColorZilla by moving your mouse over it, you simply can not find the color of a website is an extension of that. You can also zoom in on pages two points, export color codes and much more that can measure the distance.
If you create a new blog, you should definitely try this extension of an existing redesigning think about.