Firefox extensions no longer recognized

[Jim]

On 5/4/19 8:52 AM, Jason Franklin wrote:
> Greetings,
> 
> Ubuntu version: 18.04.2 LTS
> 
> Recently I opened Firefox to discover that none of the extensions I
> have installed and used for months are recognized.  I see messages
> under Legacy Extensions that say...
> 
>> [Extension Name] could not be verified for use in Firefox
>> and has been disabled.
> 
> Among the plugins I use are "HTTPS Everywhere" and "uBlock Origin".
> 
> This appears to have surfaced after a recent update, and all software
> on my system is reported as up-to-date by apt.
> 
> Has anyone else experienced this problem?
> 
> Thanks,
> Jason Franklin
> 
> 
> 

Maybe a result of this: 
https://www.engadget.com/2019/05/03/firefox-extension-add-on-cert/

Regards, Jim