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Re: Can't install addons for firefox

On 2019-05-04, Jonas Smedegaard <jonas@xxxxxxxx> wrote:
> It is an error in Mozilla infrastructure upstream - they have fixed it
> by abusing a backdoor in Firefox to update a certificate, but Debian
> has that backdoor disabled by default.
> https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-fire
> fox/

Note that the fix does not apply to Firefox ESR (which the OP is using). 

The boys at first were very polite about my medals and asked me what I had done
to get them. I showed them the papers, which were written in very beautiful
language and full of fratellanza and abnegazione, but which really said, with
the adjectives removed, that I had been given the medals because I was 
an American. - "Another Country"