A freshly installed copy of Firefox is a great software package, but what makes this open-source browser so special is the ability to customize it via extensions and themes to really make it yours. The problem is, there are so many available add-ins, it's tough to know what's worth installing and what's just going to junk up your system.
1.Gmail Manager & Yahoo Mail Notifier:
2.Colorful Tabs
It colors each of your tabs using lovely pastel colors. After a long day of research, this becomes more than just something pretty and can make life easier on tired eyes.
3.Lock tabs:
Install:
https://addons.mozilla.org/en-US/firefox/addon/3780
4.Thumbnails Preview:
Install:
https://addons.mozilla.org/en-US/firefox/addons/policy/0/5045/17446
5.PassWord Maker:
install:
https://addons.mozilla.org/en-US/firefox/addon/469
6.Master Password Timeout:install:
https://addons.mozilla.org/en-US/firefox/addon/1275
7.G-Mail Skin:
install:
https://addons.mozilla.org/en-US/firefox/addon/2127
8.Better Gmail:install:
https://addons.mozilla.org/en-US/firefox/addon/4866
8.Tab Catalog:
https://addons.mozilla.org/en-US/firefox/addon/1937
9.Cookie Watcher:install:
https://addons.mozilla.org/en-US/firefox/addon/1201
10.Stylish:install:
https://addons.mozilla.org/en-US/firefox/addon/2108
11.PDF (Portable Document File) download:install:
https://addons.mozilla.org/en-US/firefox/addon/636
12.Download Manager Tweek:install:
https://addons.mozilla.org/en-US/firefox/addon/256