=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 301 Moved Permanently
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Date: Thu, 02 Dec 2021 02:20:21 GMT
Location: /mn/firefox/addon/748/?lang=ja
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HTTP/1.1 301 Moved Permanently
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Date: Thu, 02 Dec 2021 02:20:22 GMT
Location: /mn/firefox/addon/greasemonkey/
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HTTP/1.1 200 OK
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Date: Thu, 02 Dec 2021 02:20:22 GMT
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Request headers
================
HEAD /mn/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.