The userscript Clean Sidebar removes unwanted elements from the sidebar of twitter homepage.

Ecofont can save printer ink usages up to 20%.

Bookmarklets are easier to use and I prefer them over browser add-ons.  Here are five suggested bookmarklets  you should have.

Print Friendly is an online tool, which makes printing webpages a much efficient task.

Purifyr is a tool to remove worthless contents from webpages. It removes advertisements, header, footer etc. and enhances the reading experience.