Just to confirm, this does happen on a clean account, with AppArmor set to complain only for /usr/bin/firefox and /usr/lib/firefox-esr/firefox-esr. Any add-on fails to install; I've tried NoScript (one of the most popular ones), and To Google Translate (was on the home page).

So I assume it's the upstream issue.

On 04/05/2019 23:35, Matthew Toseland wrote:
Package: firefox-esr
Version: 60.6.1esr-1
Severity: normal
Tags: upstream

Dear Maintainer,

Reinstalling add-ons is broken in Firefox. This appears to be an
upstream bug:
https://discourse.mozilla.org/t/certificate-issue-causing-add-ons-to-be-disabled-or-fail-to-install/39047

What I did:
- NoScript was installed. Broken due to recent policy changes requiring
   a newer version, attempt to reinstall.
- Reinstalling consistently fails claiming the plugin is corrupt.
- Googling shows it is likely to be the above bug.

I have reproduced this with my AppArmor rules turned off so that is not
the problem.

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