Gnome Shell extensions: Attempt to postMessage on disconnected port

I just installed Ubuntu 16.04 and the Gnome shell 3.18.5. I'm new to the whole 'Gnome Shell extension'-thing (I use my browser to install user-made extensions?) ..

So, the first time I accessed https://extensions.gnome.org I could install an extension I think but now it shows me a message (for example when I navigate to https://extensions.gnome.org/local/): "Attempt to postMessage on disconnected port":

I can't seem to do anything on that website anymore. When I view an extension on the website I can't find any install button or anything (but then I'm not really sure how it is supposed to work).

I tried to install the extension "Hide Top Bar" and also have the Gnome Tweak Tool installed.

How would I install that tool with the command line?

$ sudo apt-get install gnome-shell-extensions-hide-top-bar

does not seem to work (E: Unable to locate package gnome-shell-extensions-hide-top-bar)

Ubuntu 16.04

Well, I found the answer, I didn't have chrome-gnome-shell installed.

• I checked my Firefox extensions (type about:addons in the firefox url bar). The GNOME Shell integration was listed there.
• Click on More to read instructions:

This extension provides integration with GNOME Shell and the corresponding extensions repository https://extensions.gnome.org You MUST install native connector for this extension to work. [...] For Ubuntu Linux package is available in ne0sight/chrome-gnome-shell PPA. To install it type: sudo add-apt-repository ppa:ne0sight/chrome-gnome-shell sudo apt-get update sudo apt-get install chrome-gnome-shell

• And this is what I did:

  sudo add-apt-repository ppa:ne0sight/chrome-gnome-shell

  sudo apt-get update

  sudo apt-get install chrome-gnome-shell

Now there is a on/off slider at the top right on the page of each extension.


Ubuntu 16.10 (additional information from TrailRider)

chrome-gnome-shell is in the 16.10 repos (not sure about 16.04) so you can install it with the software center or via apt-get BUT it WILL NOT work and you will get the same error. Installing the ppa and then running apt-get upgrade will update chrome-gnome-shell to a more current version and it will work. I had some confusion after I installed and it would still give me the error so I added this info in a comment [update: I included it in the answer for more visibility]