If you don’t like watching YouTube ads at the start or in between videos, a bug may help where, you’ll actually be able to skip ads entirely. All users have to do is add an extra period in the middle of the video’s URL and it will skip the ads. It also seems to work with websites that have paywalls as well.
So if your YouTube video’s URL is “youtube.com/video”, all you need to do is insert a period at the end of the “com” so that it reads “youtube.com./video” and you are done. Since this bug is going to cost YouTube to lose revenue from ads that are being skipped, we’re sure that it is going to be patched very quickly, if it hasn’t already.
According to a post on Reddit by u/unicorn4sale, “It’s a commonly forgotten edge case, websites forget to normalize the hostname, the content is still served, but there’s no hostname match on the browser so no cookies and broken CORS – and lots of bigger sites use a different domain to serve ads/media with a whitelist that doesn’t contain the extra dot”
So this may be an oversight and a fix should be just as simple as the exploit, so if it doesn’t work for you the next time you try it, there’s a good chance that the website has already fixed it.