Bootube

BooTube is a powerful, privacy-first extension that ensures a family-friendly viewing experience by proactively ghosting bad words on YouTube.

Key features:

Automatically turns on Closed Captions (CC) behind the scenes to read upcoming dialog.
Uses Proportional Interpolation to calculate the exact sub-second a word is spoken, guaranteeing frame-perfect muting.
Instantly mutes the audio and applies a heavy blur to the video player to prevent lip-reading or seeing visually offensive content.
Fully supports foreign language captions with our custom translation-sync algorithm.
Features a customizable, obfuscated blocklist menu so you can safely add or remove words.
How to use it:

Install the extension.
Click the BooTube ghost icon in your toolbar to customize your blocked word list.
Open any YouTube video. The extension will automatically enable captions and censor the content seamlessly.
Privacy Note: BooTube runs entirely locally on your machine. Your blocklist and browsing data are never sent to any external servers.

Category Productivity

Single Purpose Censors profanity in YouTube videos by automatically muting the audio and blurring the screen based on closed captions.

Permissions Justification (For the Privacy Tab)
storage: Required to save the user's customized blocklist of censored words so it persists across sessions.

*://www.youtube.com/*: Required to inject the content script into YouTube pages to read the captions and apply muting/blurring to the video element.