Problem downloading add-ons

I tried installing several ad-blocker add-ons. Each time, I got the message “Download failed. Please check your connection.” I was unable to find anything wrong with my connection.

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Same problem I’m having. My ad blocker got disqualified, so I tried to install a new one…then several different ones. Sometimes I would get ‘Firefox has determined this file is corrupted’, even for Firefox-specific ad blockers. Most often it was the ‘check connection’ message, though. My internet experience is so annoying now, I’ve switched back to Safari…

Please see https://support.mozilla.org/kb/add-ons-disabled-or-fail-to-install-firefox for information on how to fix your Firefox.

I tried to install Norton Password which is even included in Mozilla addons, but it is shown that the connection fails… but it is not true! How can I do it?
tks… regards