gnome - Why is the Advanced section Update tab in Thunderbird blank?

I recently install Thunderbird, but found that in the Preferences, if you go to the Advanced section, and then the Update tab, you find that it is blank:

Is this a bug? Or is it meant to be so on my system for some reason?

---

OS Information:

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.04
Release: 15.04
Codename: vivid
Flavour: GNOME
GNOME Version: 3.16

Package Information:

thunderbird:
  Installed: 1:31.8.0+build1-0ubuntu0.15.04.1
  Candidate: 1:31.8.0+build1-0ubuntu0.15.04.1
  Version table:
 *** 1:31.8.0+build1-0ubuntu0.15.04.1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ vivid-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ vivid-security/main amd64 Packages
        100 /var/lib/dpkg/status
     1:31.6.0+build1-0ubuntu1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages

Same here and it's not a bug. It's the normal behavior, if you installed Thunderbird via package manager (apt).

In this tab you configure whether Thunderbird automatically checks for updates. Since the package manager (apt) takes care of updates, this tab is empty.

And it makes no sense to use this tab, as Thunderbird doesn't runs with sudo rights and therefore can't update.