H1. sudo apt-get install flashplugin-nonfree-extrasound
2. change location of firefox cache (e.g., to tmpfs):
1. assmume /tmp/foo/firefox.cache exists and /tmp is mounted as tmpfs 2. open firefox 3. enter uri of about:config 4. add or modify entry 'browser.cache.disk.parent_directory' to point to '/tmp/foo/firefox.cache'