Just click anywhere in the page and type “danger” to skip the SSL warning screen in Google Chrome. You won’t see the letters as you type them.
You can probably get the best information here: http://support.mozilla.com/en-US/kb/updating%20firefox
Here’s what I did:
* I installed the new firefox in /opt/firefox
* I made sure that my user has write access to that directory
* I stopped using the Ubuntu packaged firefox.
This way, I get the latest updates automatically 🙂