You can install Synaptic with sudo apt-get install synaptic.
I personally find it more useful than the Software Center... :) This is a one time only use of (not stored for future reinstalls), keep specific override, to reinstall all packages in your system but not oracle-java8-jre.
It is strongly recommended that you do not turn off add-on update checking, as you may miss critical security updates to your installed add-ons.
It will open your default email program and you just need to enter the email address of your friend.
I've done this before but would not recommend running this way.
Better yet, Firefox is pretty easy to download, install and use. Find the "email link" icon, click and hold it to drag it where you want it to show (the toolbar in the top of the window, for example). From now on, the button will always be there, and you don't need to do this again.
Now, when you are on a page and want to mail it to a friend, just click the symbol with the envelope on it.
It is possible to hold more than one packages with one command and use wildcards. The summary is that hold at apt-get / aptitude level is not triggering hold status in dpkg (see bug 72806 especially) and update-manager reads status from dpkg.
workaround is run as root: Lock Version to prevent it being updated.
Downloading and Installing Firefox Using Firefox Search Customizing Firefox Community Q&A Despite a wealth of competition that includes Chrome, Safari and Internet Explorer, Mozilla Firefox remains one of the most effective and popular browsers on the market—and it's free.
Known for its speed and resistance to viruses, Firefox has maintained its niche among consumers despite the fact that it isn't linked to a major operating system. Go to "customize", as shown in part 3, step 4 of this article.
This is typically the case with long term releases.
Firefox puts out what they call ESRs (Extended Service Releases) which typically have a wider target audience of distributions that they support.
You can "sometimes" find prebuilt versions of Firefox and it's corresponding packages (XUL - aka. These libraries can "sometimes" be unpackaged on Cent OS 5.x into a separate directory and then brought into the mix when invoking Firefox.
This has the effect of allowing Firefox to run with the newer libraries it wants while still leaving your Cent OS 5.x system's central libraries intact for the rest of the system.