.. with this plug in , about 2 MB size

1: Hyperwords - All in the Right Click!
2: Paste Email - No more repetitive typing!
3: Read it Later - Just a click to Save!
4: Shareaholic - The easiest way to share!
5: Next Tab - Open links in the next tab
6: TinyUrl Creator - Easy Tiny Url Creation

from the site:

Do you know exactly how you spend your time while surfing the web? Do you spend too much time on a given site, and you think you should cut back (Excluding Mashable, of course?) Well, the wonderful world of Firefox extensions can help you monitor your usage and better plan your web browsing, some will even help you control yourself by placing blocks on which sites you visit, and how long you can visit them. So, find one you like, get it installed, and start earning back some time in your life!

 

Look at the left : All most known browsers have been used to downaload  the same web page: Lyngsat's Hotbird 13E page As it is shown Mozilla ver 1.7 is the most heavy with 58 KB There are two operas: The first (and lightest) is  Opera 3 , a very old version The other  opera version is V7 Green browser  is a over-set for Internet Explorer ,previously known as MyiE , offers a very nice set of addons to IE  It can be found on this site: http://www.morequick.com The standard explorer IE  though i very seldom use it, eats an  intermediate level of memory