I have the firefox package (Firefox 3.6) installed in Ubuntu 10.04. I'd like to install Firefox 4.0 from the Mozilla PPA but keep 3.6? The instructions look like they'll replace the current firefox package with the new firefox. Is it possible to install both using apt-get? Is there a way to name the executables firefox-3.6 and firefox-4.0 and have firefox point at one of them?
If you can't use apt, what's the best way to install multiple packages with the same name that will automatically update themselves (or at least be easy to update)?
If you use ubuntu-mozilla-daily ppa from mozillateam, it won't replace your 3.6. However, you won't get stable versions. For instance, that ppa is distributing Firefox 7.0a1 now.
sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa
sudo apt-get update
sudo apt-get install firefox-trunk
If you want Firefox 5 Beta, use ppa:mozillateam/firefox-next.
For more info see http://www.webgapps.org/tutorials/firefox/general/installing-other-versions and the Firefox 4 Mega Thread.
If you want to test multiple versions, then check my FoxTester extension:
http://www.webgapps.org/add-ons/foxtester
https://addons.mozilla.org/en-US/firefox/addon/foxtester/
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