Can't installing Firefox extension

Can't installing Firefox extension
The addon could not be downloaded because of a connection failure.
I use the latest version of Firefox 45.0.1
It is blocked or not.? I have been using kaspersky interner security 2016(16.0.1.445)


1Password Version: 4.6.0.604
Extension Version: \
OS Version: windows10
Sync Type: Not Provided

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