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I have a notebook with Windows 8.1 and Firefox 66.0.3; all the add-ons got suddenly disabled. So I uninstalled them and tried to reinstall them from Mozilla web page but I get a red label that says something about a download failed, check your connection.

Also tried by deleting the user profile with same results.

What can be wrong?

E_Blue
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    This seems to likely be an certificate issue on Mozilla's side. – Anaksunaman May 04 '19 at 06:03
  • @Anaksunaman But why only in my notebook? Now I'm from my PC(W7 x64) and work fine. Also why don't download them? – E_Blue May 04 '19 at 06:17
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    Offhand, I don't know why only your notebook browser might have this issue. But the [bug report](https://bugzilla.mozilla.org/show_bug.cgi?id=1548973) seems to indicate that downloads are apparently affected as well -- "Firefox marked addons due signing as unsupported, but doesn't allow re-downloads from AMO → All extensions disabled due to expiration of intermediate signing cert". – Anaksunaman May 04 '19 at 06:31
  • My understanding is that Firefox blocks addons with "issues". – Anaksunaman May 04 '19 at 06:33

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