Empty the Trash in Command Line

rm -fr /home/name/.local/share/Trash/info/* 

rm -fr /home/name/.local/share/Trash/files/*

Install Firefox 25 in 5 easy steps

1. Download

Download the release from the official channels page:
www.mozilla.com/firefox/channels/
A 64 bit build is also available in the x86_64 directory of Mozilla's FTP.
This how-to supposes that the downloaded file is saved in the “Downloads” directory situated in your home directory.

2. Extract

The downloaded file is a compressed .tar.bz2 archive. In case you want to Learn more on these extensions: tar, bzip2. To extract this juicy archive, open the Downloads directory. Look for a file named firefox-25.0.tar.bz2, right-click on it and select “extract here”.
Alternatively, you can extract the archive from the command line:
cd ~/Downloads/

tar xjf firefox-25.0.tar.bz2

For those interested, here are the tar arguments used in the command:
x : eXtract
j : deal with bzipped file
f : read from a file (rather than a tape device)
The firefox-245.0.tar.bz2 archive can now be deleted.

3. Move to /opt

External programs like LibreOffice, Google Chrome, Adobe reader, ... are all installed in the /opt directory. If you want more info about why /opt, check out these two links:
Where to install my products on linux?
Filesystem Hierarchy Standard
If you already had a previous Firefox version installed in the /opt directory, remove it with the following command:

sudo rm -r /opt/firefox

Now move the firefox directory (which was created in your Downloads folder during extraction) to /opt:

sudo mv firefox /opt/firefox25

4. Set up symbolic links

Depending on you usage pattern, follow the instructions for case 1 OR for case 2.

Case 1: you want to use Firefox 25 as you default browser:

“Backup” the old Firefox launcher: sudo mv /usr/bin/firefox /usr/bin/firefox-old Create a symbolic link pointing to the new Firefox version: sudo ln -s /opt/firefox25/firefox /usr/bin/firefox No need to update your icons/shortcuts, they should now launch the new version of Firefox. Your old Firefox version is still installed. If you want to use it, run firefox-old in a terminal or create shortcuts/icons referring to firefox-old.

Case 2: you want to keep using your “old” Firefox by default:

Create a symbolic link pointing to the new Firefox version: sudo ln -s /opt/firefox25/firefox /usr/bin/firefox254 Launch the newly installed Firefox by running firefox25 in a terminal, or create shortcuts/icons referring to firefox25.

5. Updates & Final

Firefox will manage its own updates independently of your system's package manager, an download subsequent releases. There will be no need to repeat the whole “procedure”... Enjoy Firefox!

Source : http://www.libre-software.net/how-to-install-firefox-on-ubuntu-linux-mint
Alternatif : http://www.cyberciti.biz/faq/howto-install-firefox-14-0-1-tar-bz2-in-linux/