Basically Firefox on Ubuntu provides 4 modes of update. Daily Channels (nightly Builds), Firefox Beta, Firefox for future (named aurora), and then comes the stable release.
all you need to know is the basic terminal commnad to make everything simpler. Here you go.
1. Ubuntu: ubuntu-mozilla-daily ppa! (nightly Build)
Many howtos on this subject will tell you to install Firefox pre-versions through Mozilla’s ppa ubuntu-mozilla-daily.
Using this ppa will not only install the latest Firefox 10 nightly build, used to be called “minefield” – updated daily! It will also update your current Firefox and Thunderbird to test versions.
These testing versions are not meant to be stable. Avoid this ppa unless you know exactly what you’re doing!
If you want to install firefox on production machine, scroll down to #4
open terminal and run the following commands:
sudo apt-add-repository ppa:ubuntu-mozilla-daily/ppa
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install firefox2. The Firefox Beta ppa: mozillateam/firefox-next
The firefox-next ppa will replace your current Firefox installation with the current available version in Mozillas Beta channel. Simply run these two commands in a terminal:
sudo apt-add-repository ppa:mozillateam/firefox-next
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install firefox3. Firefox For the Future (Aurora)
You may also have a look at the Firefox Aurora ppa.
open terminal and run the following commands:
sudo apt-add-repository ppa:ubuntu-mozilla-daily/firefox-aurora
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install firefox Note: you can use only one of these three channels (Aurora, Beta, and Daily) at the same time! rememember that Aurora is not stable and is for developers only. It is the test version and a place where Mozilla team tests their new scripts and approach. So, until and unless you are a dev, we won’t recommend you to install Aurora for any purpose.
4. Firefox Stable Releases
Firefox Stable is comes bundled in most of the Linux distros. You won’t need to install or upgrade it manually because linux team updates it automatically each time you run the system update. Since Ubuntu 11.04 “Natty Narwhal”, Ubuntu will update automatically to the newest stable Firefox version when it is released. (it may take a few days more, though) This is also valid for Ubuntu 11.10 “Oneiric Ocelot” and upcoming releases.
However, if due to some reason you don’t have it installed already. you can follow the simple steps below.
open terminal and run the following commands:
sudo apt-add-repository ppa:mozillateam/firefox-stable
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install firefoxThat’s all you are ready to have Latest version of Mozilla Firefox. You just need to choose which channel you want to go with. We would prefer stable or beta version. nightly builds and aurora are unstable most of the time and they can really make you slam your head on the wall!
*Don’t subscribe/install two ppa channels at the same time, it would lead to a conflict.
*To remove the ppa, use this terminal command -> sudo apt-add-repository remove {channel name you want to remove}
Developed by Intel, the 10Gb/s bi-directional interface is technically PCI Express on a cable. It was originally designed to use fiber optics, but Intel later went with copper wiring as a mean to reduce cost and to supply power. The expansion bus can support both hubs as well as a daisy chain of up to 7 devices. Thunderbolt, which essentially takes over the Mini DisplayPort, is making its way into all Mac laptops and desktops.
USB 3.0 (5Gbps) is theoretically 10 times faster than USB 2.0 (480Mbps). You can expect three-fold to ten-fold increase in performance with current generation of USB 3.0 devices but your mileage varies depending on the type of device. In real world, you’re going to see a SandForce-based flash drive topping 250MB/s and a 5400-rpm portable drive reaching 100MB/s. USB 3.0 also provides more power, 900mA up from 500mA of USB 2.0. This will allow some demanding devices, namely USB monitors and RAIDs, to be powered with just one cable.
The interface has long been the “forgotten” mass market, high-speed interface standard. Previously available in Firewire 400 or 800 flavors, it has gradually fallen in popularity as USB 2.0 has surged. Apple, the inventor of the original IEEE 1394 “Firewire” standard, has repeatedly sent mixed messages with the ditching of Firewire first from iPods and more recently from the mainstream MacBook laptops (except for the lowest-end MacBook, oddly enough).
Brought to market in 2004 as a consumer interface targeted directly at the crowded external storage market, eSATA successfully address the issue of the interface bottleneck, and allowed fast hard drives to leverage their performance potential when located external to a server or PC. eSATA supports a data rate of 3.2Gbps, which is more than enough for the fastest hard drives, which can transfer about 120MB/s, easily better than USB 2.0 and significantly better than Firewire 800.
The notebook-exclusive slot interface was practically released the same day as the USB 3.0 specification (November 2008) and promises to enhance the ExpressCard standard for the increased speed requirements of today’s mobile technologies. Closely tied to both the PCI Express and USB 3.0 specifications, ExpressCard 2.0 supports a variety of applications involving high throughput data transfer and streaming. Maintaining backwards compatibility with the original ExpressCard specification, the hot-pluggable interface standard for I/O expansion in smaller form-factor systems will by definition coexist with the world of USB 3.0 devices. [source : 
*A new Powered-B receptable is defined with two extra contacts that enable a devices to provide up to 1000 mA to another device, such as a Wireless USB adapter. This eliminates the need for a power supply to accompany the wireless adapter…coming just a bit closer to the ideal system of a wireless link without wires (not even for power). In regular wired USB connections to a host or hub, these 2 extra contacts are not used.
Additionaly, I would like to mention that some SuperSpeed USB hardware, such as hubs, may always be more expensice than their USB 2.0 counterparts. This is because by definition, a SuperSpeed hub contains 2 hubs: One that enumerates as a SuperSpeed hub, and a second one that enumerates as a regular high-speed hub. Until the USB hub silicon becomes an integrated SuperSpeed USB + High Speed USB part, there may always be a significant price difference.