FireFox

Homepage: http://www.mozilla.com/firefox/
Add-ons: https://addons.mozilla.org/en-US/firefox/

My preferred add-ons:

NewsFox

MeasureIt

Download Statusbar
FireFTP
FoxTorrent
PDF Download

Adblock Filterset.G Updater
Adblock Plus
NoScript

CustomizeGoogle
HighlightAll

All-in-One Gestures
All-in-One Sidebar
Cooliris Previews
Fast Dial
FishEyeTabs
Informational Tab
PermaTabs
Speed Dial
Yet Another Smooth Scrolling

Foxmarks Bookmark Synchronizer

Dictionaries

FireShot
Image Toolbar
PicLens

Gmail Manager

Update Notifier
Viral Threat Level

FEBE
Print Context Menu
StatusbarEx
TrashMail.net

1. browse about:config
2. find browser.ctrlTab.previews
3. set true

You can switch back to the last tab via Ctrl + Tab.