Disable Gnash
How to Disable Gnash
To disable Gnash from the Browse activity, the Gnash file must be moved from the activities plugin directory.
Open the Terminal Activity , and enter the following commands. (If you don't have /usr/library/ directory, try /usr/lib/)
su -l cd /usr/library/mozilla/plugins mkdir bak mv libgnashplugin.so bak exit
Please note that when the XO is upgraded, Gnash is installed, so this procedure may need to be repeated after upgrades.