A quick web search for part of that HTML gives me results that suggests that string is added by the DuckDuckGo extension, if you have it installed.

• https://old.reddit.com/r/duckduckgo/comments/14r3vde/does_duckduckgo_privacy_essentials_firefox_uses/
• https://github.com/duckduckgo/duckduckgo-privacy-extension/issues/367

On mobile you can use extensions like uBlock Origin (content blocker) or Stylus (CSS injector) if you use some specific browsers, and use youtube.com in those: Firefox, Yandex Browser (ugh I know), or Kiwi Browser (Android-only). It’s a mess, I know, but it’s a solution.

How do you test a cable tester? Do you have a cable tester tester? And how do you know that you cable tester tester is in fact working, without a cable tester tester tester?

Based instance admin, based project admin, and based project developer