After years of development and several delays, multi-process Firefox, also known as Electrolysis or e10S, is about to be enabled for a subset of Firefox stable users. The following guide provides you with information about Firefox’s multi-process architecture.
from https://is.gd/PnafcT
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Mozilla plans to increase the number of content processes of Firefox’s multi-process architecture to four (from one) with the release of Firefox 54.
Some Firefox installations are still not eligible for Firefox’s multi-process architecture. This includes systems with accessibility tools or settings enabled. Multiple processes won’t be enabled for users with extensions either, regardless of whether those are legacy add-ons, or WebExtensions.
Mozilla ran its memory test again to determine the right number of content processes. An increase in the number of content processes for the browser always goes along with an increase in memory usage.
from https://is.gd/7xLhyI
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If you use Ubuntu 10.04 or any other Linux distribution which doesn’t automatically upgrade your Firefox to the latest version you can force it.
First of all you have to launch Terminal and add the right PPA to the repository:
sudo add-apt-repository ppa:ubuntu-mozilla-security/ppa
Then you need to update and upgrade the OS using:
sudo apt-get update sudo apt-get upgrade
If you are installing Firefox for the first time the right commands are:
sudo add-apt-repository ppa:ubuntu-mozilla-security/ppa sudo apt-get updatesudo apt-get install firefox firefox-gnome-support firefox-locale-en
As usual on Linux, it is not necessary to reboot the computer and you can start immediately to use your updated Firefox. 
I usually update my Firefox as soon as possible but often, especially after installing the new version 5 on a Ubuntu 11.04 platform, I had to lose many add-ons that I previously selected and used daily. To avoid this problem I found some tips on the web and I tested all of them with different results.
Solution 1
– download the .xpi file from its official Firefox add-on webpage using the right mouse button (Save Link As) on 
– unzip the .xpi file with Archive Manager and open install.rdf using a Text Editor;
– find this line: em:maxVersion and change the value from e.g. 4.0.* to 5.0.*;
– click on 
icon in the Firefox Add-ons Manager, select “Install Add-on From File…” and follow the visual instructions.
Unfortunately this solution didn’t work always during my tests
Solution 2
– open a new Tab on Firefox and type: about:config;
– agree to the warning message;
– search all the lines with the string extensions.checkCompatibility and set the values to false
– restart Firefox and enable or install your “old” add-ons.
Solution 3 – The easy one!
– open a new Tab on Firefox and click on Tools –> Add-ons;
– search for the Add-on Compatibility Reporter and install it;
– restart Firefox and you will be able to install all the old add-ons.
Sometimes you will discover that installing “old” add-ons doesn’t mean that they really run on Firefox 5 but, in my experience, more than the 70% of them will be good for the new version. Have fun!!
Technorati Tags: Firefox, install, Firefox 5, Ubuntu, Ubuntu 11.04, tutorial
In 2007, when Prism was launched, there were some enthusiastic reviews about this application. Then the widget era began and Prism popularity decreased. Anyway, Prism is still a powerful application for all that people who desire to run their more often used web application saving RAM and CPU resources. Prism, based on XULRunner, is multi platform, easy to use and very flexible. To use it on Ubuntu you can launch the Terminal and type:
sudo apt-get install prism
or using the Synaptics Package Manager (System —> Administration —> Synaptics Package Manager). Then go to Applications —> Internet —> Prism and a small windows appears. Now, fill in all the required information: the web application URL, the name you prefer, settings and do not forget to click on the Desktop shortcut option. At this point you will find a new rough icon on your Desktop with the name you chose. The first time you use it, with the right mouse button click on it and go to Properties —> Permissions and Allow executing file as program. If you want to change the icon you have to click on it (with the right mouse button), go to Properties —> Basic and choose your favorite icon clicking the icon on the upper left corner. If all are steps are annoying for you, it is possible to use Prism as add-on for Firefox. In this case, on Firefox, go to Tools —> Add-ons —> Get Add-ons and type Prism on the search bar. You will install Prism as a simple add-on for Firefox. Now, you can automatically generate a Prism application just clicking on Tools —> Convert Website to Application when you are in the web application page.
On Windows or MAC we suggest to download the standalone package directly from the official web page or install Prism as Firefox add-on following the same steps we described for Ubuntu. If you use the Prism standalone package you have to decompress it in your favorite location. For Windows users: when you set up a new Prism application, try the tray menu option but do not forget to click on the Desktop shortcut or you will not be able to find again the application after you close it.
In my experience, Prism is really useful with all the Google web applications, with Zoho services and Pandora. Try and enjoy it! 
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