I recently upgraded to 18.04 and since then, I've been receiving a "gnome extensions" notification.
When I click on it, I get this screen on my browser.
My questions are:
- What are these extensions for?
- Are they extensions for the browser?
- How can I disable this particular notification ... if I decide not to install these extensions?
To extend funtionality of your desktop
No.
You get these because you have 3 of them active. Probably means it is telling you you need to update them since you probably are using the 16.04 versions.
You can disable the notifications in "settings" on all or on individual options.