http://www.mozilla.com/en-US/ - Download FireFox

https://addons.mozilla.org/en-US/firefox/addon/1865 - AdBlock Plus
https://addons.mozilla.org/en-US/firefox/addon/722-NoScript(read what this is before you install)
https://addons.mozilla.org/en-US/firefox/addon/1523 - Tab color based on page
https://addons.mozilla.org/en-US/firefox/addon/4882 - Tab Scope
https://addons.mozilla.org/en-US/firefox/addon/4242 - Customize how any page looks
https://addons.mozilla.org/en-US/firefox/addon/6991 - Customize Firefox looks
https://addons.mozilla.org/en-US/firefox/addon/201 - Download Manager
https://addons.mozilla.org/en-US/firefox/addon/2324 - Session Manager
https://addons.mozilla.org/en-US/firefox/addon/1803 - Content filter
https://addons.mozilla.org/en-US/firefox/addon/2570 - "Resurrect Pages"
https://addons.mozilla.org/en-US/firefox/addon/1419 - IE tab
https://addons.mozilla.org/en-US/firefox/addon/26 - Download Statusbar
https://addons.mozilla.org/en-US/firefox/addon/7661 - Read it later

toolbar.google.com/ - Google Toolbar

https://addons.mozilla.org/en-US/firefox/addon/4014 - Locationbar² (like GoogleChrome)
https://addons.mozilla.org/en-US/firefox/addon/4810 - SpeedDial (like Opera)
https://addons.mozilla.org/en-US/firefox/addon/1810 - Showcase (like Opera)?

More advanced:
https://addons.mozilla.org/en-US/firefox/addon/60 - Web Developer (tones of cool stuff that let you alter the page you are on! {client side})
https://addons.mozilla.org/en-US/firefox/addon/3863 - Macro your browsing!
https://addons.mozilla.org/en-US/firefox/addon/573?application=firefox&id=573 - Add/Edit cookies
https://addons.mozilla.org/en-US/firefox/addon/220 - FlashGot (it works with your preferred Download manager)
https://addons.mozilla.org/en-US/firefox/addon/5791 - Flagfox (where is server)

-Here below are some good things to know that makes the web easier to use:
Use CTRL + F then type what-ever you wish to find to search the page's text.
-In Firefox, right click on a web page and click View Page info to get when the page was last modified (if it is the same day, it may be automatically modified every day especially if it is a big professional complicated website) and a lot of other info.
-If you try going to a website where the page is not found, try useing a website that caches (stores) internet sites, like the Wayback Machine or Google Cache (google search cache: then the web address. These caches only store the text, not the images & video, so if the website has gotten rid of the images the sites tend to look different.

Enjoy!