I watch a couple playthroughs on youtube and I normally don't pay attention to what browser I use while viewing them. I haven't seen this mentioned anywhere yet, but last week, I noticed youtube was forcing lower quality videos for IE11 on Windows 7 (maximum of 720p). Ironically, you can still press F12 and change the browser's agent string to IE10/Firefox to view 1080p and 4k videos just fine. In the quality dropdown there is a link saying "Missing options?" which primarily suggests upgrading your browser to Chrome or upgrading Windows to continue using IE11. I actually do have both firefox and chrome installed for compatibility reasons, however I feel it is rather misleading to throttle connections or degrade video quality in order to get people to switch to Chrome. While this is Google, it hits very close to all of the backwards things that Microsoft has done to get people to upgrade to Windows 10.
source: YouTube videos missing quality options on this browser
source: YouTube videos missing quality options on this browser
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