How can I hide the WHO covid-19 banner on YouTube?

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Video: https://youtu.be/gAk7aX5hksU

Brief description of my search/research efforts: searched on Google, found nothing.

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    Please add a brief description of your search/research efforts as is suggested in How to Ask. – Rubén Mar 30 '20 at 14:13
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    Close voter: what is unclear? – Franck Dernoncourt Mar 30 '20 at 14:15
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    Searched what on Google? – TRiG Mar 30 '20 at 22:11
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    @TRiG "hide the WHO covid-19 banner on YouTube" – Franck Dernoncourt Mar 30 '20 at 22:19
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    @Harper-ReinstateMonica sorry you're right, Google would never tell me how to change YouTube's default settings. – Franck Dernoncourt Mar 31 '20 at 6:56

On desktop browsers one way to block this is using the uBlock origin extension. Right click after installing it, and select "block element". The element you want to block is:

###clarify-box > .ytd-watch-flexy.style-scope

From your screenshot, it seems you are browsing youtube using the chrome web-browser, but with "Desktop site" enabled, is that right? If you turn that off it should not be displayed

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    It works in my Android Firefox in the very same way. – Vladimir F Mar 30 '20 at 21:11
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    I love you. I had trouble blocking clarify-box by id in tampermonkey. This just works, and I'll use it to save time blocking annoying stuff again and again in the future. – Tom Mercer May 8 '20 at 21:50

On Firefox on Windows 10, you can do this without installing any plugins. In this folder,

C:\Users\<your Windows login username>\AppData\Roaming\Mozilla\Firefox\Profiles\chrome\

create a folder named "chrome". Inside this folder, create a file with the name userChrome.css. Add this to it:

#clarify-box > .ytd-watch-flexy.style-scope {
    display: none;

This technique allows you to modify the css of any part of any site, not just YouTube.

  • Nice trick, thanks! – Franck Dernoncourt Mar 30 '20 at 20:15
  • Do chrome/userChrome.css and chrome/userContent.css really work from the Profiles directory? I always put them into <profile>/chrome/ – cg909 Mar 31 '20 at 22:56
  • Oh you're right. Sorry, forgot that bit. Edited. – kloddant Mar 31 '20 at 23:23
  • Who knows how long this will work. Google removed user-stylesheets from Chrome (and thus all Chromium-based browsers) a long time ago (which was the last straw that finally made me abandon it and switch to Firefox). The Mozilla devs have been acting a lot like the Chrome devs of late and doing whatever they want and ignoring user feedback (eg dropping support for PWAs), so I wouldn't be surprised if they eventually drop user-stylesheets too. 😒 – Synetech Apr 3 at 17:41

As a complement to oaeide's answer, one can use oaeide's code with Adblock Plus Chrome extension:

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    Just for the record: AdBlock Plus is significantly worse than uBlock Origin at blocking ads, and its rule system is much less capable. Plus, it runs the Acceptable Ads initiative (which has been termed “an extortion racket”) and hence will whitelist ads from companies that have paid for the privilege. And it's slower… – wizzwizz4 Mar 30 '20 at 19:49
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    @wizzwizz4 thanks, good to know! – Franck Dernoncourt Mar 30 '20 at 20:00
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    @wizzwizz4 You can turn off "Acceptable Ads" in the addon settings, you know. – mbomb007 Mar 31 '20 at 21:18
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    @mbomb007 I didn't, thanks; but that's not the point. The point is that I didn't know it could be disabled, and most people won't even know that they should disable it – the name is sufficiently misleading that even people like me, who go into the settings of the software they use, might leave it on. And ABP's capabilities are still limited enough that Google – an advertising firm – is happy to make its system the only possible ad-blocking mechanism in Chrome. – wizzwizz4 Mar 31 '20 at 21:26
  • @wizzwizz4 Anyone who has ever used ABP and opened the settings once could see it can be disabled. It's a checkbox on the main settings page. Anyways, if you care about privacy and ad blocking, use Brave instead of Chrome, because Chrome sends your data to Google anyway. – mbomb007 Mar 31 '20 at 21:29

Very easy way. I did it on Firefox and Brave. The banner has several parts. For Brave: Right click on Covid 19 banner. On pop-up point to Brave (or your adblocker installed) - Block element via selector - on new pop-up click OK. Repeat it for each part. For Firefox you need uBlock Origin installed. Right click on Covid 19 banner. On pop-up point to uBlock Origin icon. On next pop-up click Create. Repeat it for each part.

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