So the add ons that are downloaded here , are never verified.
This is what i started to think.
 

Thank you so much for your reply

Yes it would seem that Versions that are downloaded from AMO are signed by AMO

Mozilla have decided that all Extension Versions NOT downloaded from AMO will no longer function in Firefox anymore.
Hence the  sudden appearance of this so called "problem"

EF thought that Versions downloaded from this site might be the cause of this problem, and it would seem that he is right

So if you youself were to go to AMO and download from there you should then hopefully not encounter any problems in the future of this kind

Many thanks again for the feedback

Thank you for the feedback @badtrip.  Unfortunately, when there were many problems with Fast Dial in earlier versions, many people downloaded versions from userlogos, since the versions on AMO were usually behind in fixes and the ones on Userlogos were current.  That's why I think there are some people that have problems now.

@ef
Yes exactly

The local downloads of xpi's one hopes will however continue as it has a useful function

If we put a health warning on these xpi's or even as I have suggested modify the fastdial.js folder in these xpis then we should be able to continue with customised versions, like many other extensions do, with downloads from the support site

This problem has only developed from Mozilla Addons has become over protective