[Pkg-chromium-maint] Bug#854582: chromium: Message error "installation is not enabled" when i try to install an extension.

[theShort]

Package: chromium
Version: 55
Severity: important

Dear Maintainer,

I'm a Debian 9.0 user with Cinnamon 3.2.7. I have installed Chromium vers.55
and when I try to install extensions I receive the message error "Installation
is not enabled"

I try to reinstall it, remove and create a new user, but this did not solve the
problem.
Furthermore, I also installed the version 56 in Debian Sid repository, but the
problem persists.

How do I fix?

Thanks for the attention.



-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (900, 'testing'), (600, 'unstable'), (50, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.2.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=it_IT.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)