Get custom new tab page with Metro UI. This add-on for Firefox offers several features such as speed dial, e-mail, Facebook/Twitter integration, clock, and weather.
Here is more about this add-on from the developer:
new metroTab is an addons that replaces the new tab page with a more customizable version, with Metro interface.
Also, includes some tiles that can retrieve information from their page and show it to the user in the same page.
To add a tile, customize the look of the page or change the options (like the weather location), put the cursor over the avatar in the upper right corner and select the option on the menu.
Want to check out this fantastic add-on? You can pick up New metroTab at the Firefox Add-ons website.