i guess that desactivate flash was not enough
after having uninstalled flash, gnash was finally taken into account
problem solved
** Changed in: gnash (Ubuntu)
Status: New = Invalid
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mozilla-plugin-gnash can't be installed within Firefox
https://bugs.launchpad.net/bugs/569903
You
Also in a terminal which libgnashplugin.so doesn't give anything
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mozilla-plugin-gnash can't be installed within Firefox
https://bugs.launchpad.net/bugs/569903
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