How can I install the new version of Flashplayer in Firefox.

[Stephen]

I went to plugins in firefox and it told me that flashplayer needed to 
be updated. I clicked on the button to update it now, and it sent me to 
a web site where it could be downloaded.

I chose the APT selection for ubuntu 10.04+. When I clicked on the 
download button it gave me a box and asked me to choose the app to 
download it with.

I checked the web and couldn't find any app to install this file. There 
are some websites that won't work for me without this plugin.

I would appreciate any help I can get.

Thanks in advance;
Stephen