1 item
用可拖动、可缩放的遮罩挡住视频字幕，帮助你进行无字幕听力练习。 Caption Mask 为网页视频添加一块简单的字幕遮罩，帮助语言学习者进行无字幕听力练习。 使用方法： 1. 打开播放视频的网页。 2. 点击 Caption Mask 图标，或按 `Alt+M`，显示遮罩。 3. 拖动遮罩调整位置；拖动右下角调整大小。 4. 鼠标移入遮罩时，遮罩会暂时变透明，便于核对字幕。 5. 再次点击图标或按 `Alt+M` 隐藏遮罩。 扩展会在本机记住上次的位置和尺寸，并支持常见网页播放器的全屏模式。它不收集或上传网页内容及浏览数据。
rating_count is the Chrome Web Store ratings count, not a written-review count.
Media assets
Screenshots and videos on the listing.
Has promo video
Whether the listing includes at least one video.
Languages
Declared language locales.
Developer website
Listing exposes a developer website URL.
Contact email
Listing exposes a contact email.
Keyword in name
Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.