I've downloaded an update for Firefox which is now in my Downloads folder. How do I get it from there to open and replace my existing version 20? I've tried double-clicking the download, but nothing happens. If I right-click the download, I can 'Open Containing Folder', but this just takes me to a TMP folder, containing other files & folders.
I'm new to Ubuntu, but in Windows and OS X, I just double-clicked the download and it would install the necessary stuff in all the right places.
Frustrated and getting off to a bad start...