With GNOME Shell Extensions Updater, you can update all the extensions installed from extensions.gnome.org with a single click. This extension checks for updated extensions every 5 days and displays a notification in the GNOME Shell Message Tray with all the available updates:
To install the updates, simply click "Update all" and all the extensions should be automatically updated:
GNOME Shell Extension Updater is not available on the GNOME Shell Extensions website, but you can easily install it using the commands below. Firstly, install GIT - in Ubuntu, use the following command:
sudo apt-get install git-core
Then, to install the extension on any distro running GNOME Shell 3.4 or 3.2, copy/paste the following commands in a terminal:
Once installed, restart GNOME Shell and activate the extension using GNOME Tweak Tool.
cd git clone git://github.com/eonpatapon/gnome-shell-extension-updater.git cd gnome-shell-extension-updater ./install.sh
There aren't any settings to change the update check interval, but if you really need to change it, you can edit the ~/.firstname.lastname@example.org/extension.js file and modify the "UPDATE_INTERVAL" value to whatever you want.
via Reda Lazri @ G+