[Environment:] Browser / Version: Firefox Nightly 63.0a1 (2018-08-27) Operating System: Windows 10 Pro [Prerequisites:] 1. Tracking Protection Basic enabled. [Steps to Reproduce:] 1. Navigate to https://buy.guildwars2.com/store?Action=html&Locale=en_IE&SiteID=gw2&cid=104%3A5%3A%3A%3A%3AGlobal%3A289%3A%3A%3A&pbPage=pathoffire&themeID=4785548100 2. Scroll down the page. 3. Tap to play the video. [Expected Behavior:] Video plays. [Actual Behavior:] Video does not play. [Note:] Video link: https://www.youtube.com/embed/KBVpfsCOick?autoplay=1

The issue is related to `Videos` breakage. Looking at the devtools console, here are the blocked resources: The resource at “https://drh.img.digitalriver.com/DRHM/Storefront/Site/gw2/cm/multimedia/css/reset-min.css” was blocked because content blocking is enabled. The resource at “https://drh1.img.digitalriver.com/DRHM/Storefront/Site/gw2/cm/multimedia/js/qtip2/jquery.qtip.min.js?a” was blocked because content blocking is enabled. The resource at “https://www.googletagmanager.com/gtm.js?id=GTM-KV7FT5” was blocked because content blocking is enabled. So below are the domains to test: - drh.img.digitalriver.com - drh1.img.digitalriver.com - www.googletagmanager.com I opened the URL in a fresh browser profile (Firefox Nightly 63, uMatrix installed, normal mode) and loaded the page. It redirect to broken video placeholder. I disabled the Spoof Referrer option in uMatrix and then WHITELISTED: - digitalriver.com (including all related domains) - youtube.com (including all related domains) - googlevideo.com (including all related domains) and the video plays. The other resource (www.googletagmanager.com) didn't help. So in conclusion: - digitalriver.com is in Advertising category = [tp-ads] - youtube.com is in Content category = [tp-content] - googlevideo.com is not listed

Added uMatrix Results.