Ubuntu default installation of Firefox, but the self-contained repositories will not be updated with Firefox, I always prompt the use of Flash plug-in needs to be activated, the hint can be selected to solve the three kinds of
1. Update Flash plugin, but jump to Adobe's site cannot download plugins.
2. Long-term activation, but again when you open the page, it will pop up this prompt box.
3. Update Firefox.
Today is unbearable, download the latest Firefox installation package, download and unzip to the relevant directory.
TAR-XF firefox*
Move the extracted Firefox directory to the bottom of/opt
sudo mv firefox/opt/firefox37
Back up the original Firefox shortcuts
sudo mv/usr/bin/forefox/usr/bin/firefox_old_33
Create a new shortcut
sudo ln--symbolic/opt/firefox37/firefox-bin/usr/bin/firefox
Then log out of the current user, re-login to the system, re-open Firefox is the latest version.
New version of Ubuntu install Firefox latest