I want to know why the switch with ON/OFF has disappeared. And there appeared the message “Attempt to postMessage on disconnected port”. I remember it can be used normally before I installed the vpn lantern. How can I resolve this problem?
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Answer
The reason is because Mozilla has dropped the NPAPI support from Firefox. This affects many plugins like Siverlight, Acrobat, and Java as well as the GNOME integration plugin.
To get the GNOME website to work, you need to install chrome-gnome-shell
a native host messaging application. To do this, open a new Terminal and type the following commands.
For Ubuntu
sudo add-apt-repository ppa:ne0sight/chrome-gnome-shell sudo apt-get update && sudo apt-get install chrome-gnome-shell
For Fedora
dnf copr enable region51/chrome-gnome-shell dnf install chrome-gnome-shell
For Gentoo
emerge -av gnome-extra/chrome-gnome-shell
Also, if you are using Firefox, make sure you have GNOME Shell Integration Firefox plugin installed.