Get Slim RTM Sidebar

You can get a narrower Remember the Milk sidebar using Stylish.
There are two styles. If you use RTM on the sidebar of your Firefox, they will help you widening your contents view.

No.1

Make letters smaller.

Before After

Get it here: RTM - Sidebar Mini | userstyles.org

No.2

Arrange the order of contents.

Before After

Get it here: RTM - Sidebar More Spacious | userstyles.org
You may need to refresh page after installation for the first time.

#1 and #2 Combined

Before After

They are also applied to the iGoogle gadget

Before After

How to use RTM on the sidebar

Drag and Drop this link to your Bookmarks toolbar:
Remember The Milk Homepage Module
Then right click > properties > check a box.

How to put the sidebar on the right of your Firefox (without addons)

Install this:
Firefox - Sidebar on the Right | userstyles.org