Works great in Ubuntu 17.10 with Chrome and Firefox. With Chrome, it adds an icon to the menu bar to connect to https://extensions.gnome.org . With Firefox, this has to be done manually, AFAIK. FYI,

dpkg --list | egrep "chrome|firefox"
ii chrome-gnome-shell 9-0ubuntu1 all GNOME Shell extensions integration for web browsers
ii firefox 57.0.1+build2-0ubuntu0.17.10.1 amd64 Safe and easy web browser from Mozilla
ii firefox-locale-en 57.0.1+build2-0ubuntu0.17.10.1 amd64 English language pack for Firefox
ii google-chrome-stable 63.0.3239.108-1 amd64 The web browser from Google

不错

Works quite nicely.

extension

Thank you for this extension!

Thank you!
Absolutely necessary now that I've switched to ubuntu.

C'est vraiment une des meilleures extensions sous Firefox ! One of the best Firefox plugins !

nice

it just work.

a must-have ext for gnome users.

tested on AOSC OS and works fine.

Works great, because I followed instructions.

This is a great addon for users on the GNOME Desktop Environment. It integrates seamlessly into the GNOME desktop, providing installation, upgradation and uninstallation of GNOME Shell Extensions

Tested on Debian GNU/Linux

As said by mostly everybody, this addon requires a backend service, it does not work out of the box by just adding it to Firefox, and this is by design, so, for everyone which did not it yet, repeat with me:

Read the addon instructions!
Read the addon instructions!
Read the addon instructions!

Tested on Fedora 25 and works great.

Thanks, works fine.

Thanks, this offers a very smooth way to install gnome shell extensions via firefox.

Attempt to postMessage on disconnected port.