I'm going to mark this as a duplicate of bug 173890, since that has caused your original problem with Flash not automatically working. The flashplugin-nonfree package, which Firefox lets you install (and should work) has a bug due to the release of Adobe Flash Update 3. See more information at the bug 173890 report.
I'm going to mark this as a duplicate of bug 173890, since that has caused your original problem with Flash not automatically working. The flashplugin-nonfree package, which Firefox lets you install (and should work) has a bug due to the release of Adobe Flash Update 3. See more information at the bug 173890 report.