
Once you've disabled ad blocking, you might have to refresh the page or completely close/reopen your browser before the settings can take effect and you might also have to disable closed captions one more time. Almost all mainstream ad blockers will allow you to disable ad blocking for specific websites in the main drop down menu.
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If you find one installed, simply left click on the icon while on any page of the Khan Academy website for a drop down menu with options. AdBlock Plus, Ghostery, UBlock Origin are common ad blockers. Do you have an ad blocker installed on your browser? Well, it's worth checking for an icon along the top bar of your browser. So, obviously, the solution is to disable your adblocker for Khan Academy. Ad Blocker cookie management conflicts are actually a very common issue that many users face with website functionality as opposed to conflicts with the browser's own cookie settings, which most common users don't modify.

Why? Malicious ads can potentially read personal/confidential information about you and some ad blockers will go as far as to disable generic cookies on all websites as a blanket rule in order to protect you from malware or big data companies along aside the service of disabling advertisements from your videos and websites. Ask yourself: What blocks/disables cookies other than the browser itself? Ad Blockers. Websites store cookies to save information about your visit to the website.
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The first suggestion was something that had already been mentioned and that's to go in to your own particular YouTube Account settings and to disable "Always show captions" in the Playback settings section. This is was a small annoyance but something I felt that should have been trivial to solve. The YouTube video popups through the Khan Academy platform (NOT the Khan Academy YouTube channel itself) were constantly forgetting that I had previously disabled the Closed Captions option (some people are describing them as 'Subtitles').
