=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 301 Moved Permanently
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Content-Length: 59
Connection: close
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Date: Fri, 03 Dec 2021 10:18:01 GMT
Location: /en-US/firefox/addon/748/
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HTTP/1.1 301 Moved Permanently
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Content-Length: 68
Connection: close
amo-request-id: 56a81044-e519-47b5-8df8-6f0c143b953e
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Date: Fri, 03 Dec 2021 10:18:01 GMT
Location: /en-US/firefox/addon/greasemonkey/
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HTTP/1.1 200 OK
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Content-Length: 135069
Connection: close
amo-request-id: c4074abf-dae9-4e63-9860-35d35ed7f285
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Date: Fri, 03 Dec 2021 10:18:01 GMT
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Request headers
================
HEAD /en-US/firefox/addon/greasemonkey/ HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: addons.mozilla.org
Accept: */*
Referer: http://web-marketing.zako.org
Connection: close


Link is valid.