Plugins after upgrade
There are a few things that you can try. First, plugins are stored in numberous locations on you computer. Here is where they are hidden globally: /usr/lib/mozilla/plugins, /usr/lib/mozilla-1.X.X/plugins, /usr/lib/firefox/plugins, /usr/lib/firefox-0.10.X/plugins. At the user level, you can find plugins in the following directories: /home/<user name>/.mozilla/plugins and if you use Crossover Office it will place plugins in /home/<user name>/.netscape/plugins as well.
So to find out what plugins are active on your system, open your web browser and type "about:plugins" in the address bar. This will show what plugins are currently registered with Firefox or Epiphany. As a side note, especially given Epiphany's lack of advanced settings, you can type "about:config" and do advanced configuration as well.
If you are not seeing those plugins, it may very well be that by upgrading to test 3, the install removed your previous /usr/lib/firefox/plugins or mozilla/plugins directory. Also, check to see how many firefox and mozilla directories you have under /usr/lib. What I do is to put all global plugins into /usr/lib/mozilla/plugins, then create links to that directory from the others, i.e.: ln -s /usr/lib/mozilla/plugins /usr/lib/firefox/plugins and so on for each firefox and mozilla-1.X.X directory under /usr/lib. When a new plugin is installed through an installer program they almost always end up in either /usr/lib/mozilla/plugins or if user installed /home/<user name>/.mozilla/plugins.
I hope that helps!