Thank you John but the flashplugin-nonfree has been previously removed using Synaptic Package Manager. I found the /usr/lib/mozilla/plugins/flashplugin-alternative.so and removed it. Then I restarted the Firefox but I still see both of them (Shockwaves as seen on my attached file I added on my first post).
-- Can Not Uninstall Add-Ons https://bugs.launchpad.net/bugs/246694 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs