無料でYouTubeから動画と音声ファイルをダウンロードできるFirefox向け拡張機能「YouTube Video and Audio Downloader」 - GIGAZINE
YouTube Mp3 Downloader – Get this Extension for 🦊 Firefox (en-US)
![X-Post] "Youtube Video Downloader" Firefox add-on injecting malicious JavaScript everywhere : r/firefox](https://external-preview.redd.it/XSBwUpcD3E7ZdK13hV02ijF7AG1cdhMYWBjnAZTZUCw.jpg?width=640&crop=smart&auto=webp&s=767674d6289c80d4a96ccca35ab866a39e63c8c1 "X-Post] \"Youtube Video Downloader\" Firefox add-on injecting malicious JavaScript everywhere : r/firefox")
X-Post] "Youtube Video Downloader" Firefox add-on injecting malicious JavaScript everywhere : r/firefox
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