SUB — YouTube Subtitle by Emtu

SUB — YouTube Subtitle Tutor improves subtitle learning and viewing on YouTube.

Main features:

• Customize subtitle font, size, color, background, position, alignment, and spacing.
• Select the interface language, subtitle language, and translation language.
• Click a subtitle word to receive a contextual translation using Google Gemini.
• View the word meaning, pronunciation, base form, grammar information, and useful examples.
• Adjust YouTube audio using the built-in audio boost controls.
• Save extension preferences locally in Firefox.
• Enable optional ad-cleanup rules. This feature is disabled by default and activates only after the user enables it.

Gemini translation requires the user to provide their own Gemini API key. When the user requests a translation, the selected word, relevant subtitle context, target language, and API key are sent directly from Firefox to Google's Gemini API.

The developer does not receive or store the user's API key, subtitle content, translations, browsing history, or personal information.

This extension is unofficial and is not affiliated with YouTube, Google, or Mozilla.