=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 301 Moved Permanently
Server: CloudFront
Date: Tue, 30 Nov 2021 20:16:37 GMT
Content-Type: text/html
Content-Length: 183
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Location: https://addons.mozilla.org/firefox/addon/748
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HTTP/1.1 301 Moved Permanently
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Date: Tue, 30 Nov 2021 20:16:38 GMT
Location: /en-US/firefox/addon/748
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HTTP/1.1 301 Moved Permanently
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Date: Tue, 30 Nov 2021 20:16:39 GMT
Location: /en-US/firefox/addon/748/
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HTTP/1.1 301 Moved Permanently
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Date: Tue, 30 Nov 2021 20:16:41 GMT
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HTTP/1.1 200 OK
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Date: Tue, 30 Nov 2021 20:16:42 GMT
ETag: W/&quot;20f9c-vwYptM4gstBX5Gs21sKXkT9P66c&quot;
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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.