Assign a text track to a video element in a web page

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What is CCaptioner?

CCaptioner is a Firefox extension designed to enhance the video viewing experience by adding the ability to assign a text track or subtitles to HTML5 videos. Many video players do not offer this feature, but with CCaptioner, you can easily add a .srt or .vtt file as a text track. It can be injected into specific websites when clicked on its toolbar icon. Due to its activeTab and <all_urls> permissions, it can interact with loaded web pages and be used in embedded iframe elements. Additionally, it allows for time-shifting the text track, useful when synchronisation issues arise.

Users: 708 ▲ 9
Rating: 4.38 (8)
Version: 1.1.0 (Last updated: 2020-02-26)
Creation date: 2020-01-28
Weekly download count: 59
Firefox on Android: No
Risk impact: Moderate risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
  • activeTab
  • <all_urls>
Size: 30.47K
URLs: Website
Stats date:

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Not available on Chrome
Not available on Edge
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A very simple extension which purpose is to assign a text track to a HTML5 video element in a web page.

Many HTML5 video players do not offer the ability to import text track for captions/subtitles purpose. The purpose of this extension is to remediate this problem.

When you want to assign a text track to a video element in a web page:

  • Open the popup menu and click "Assign text track to..."
  • Move the mouse over the target video element
    • Click the video element if needed
  • A file picker will appear
  • Pick the .srt or .vtt file to use as text track

The video should now render the captions/subtitles of the file you selected.

The content scripts of CCaptioner are injected if and only if you click on its toolbar icon while on a specific web site, and only for that web site. Once the text track is embedded, the content script terminates and should be garbage-collected by your browser's JavaScript engine.

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Risk impact

CCaptioner may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.

Risk likelihood

CCaptioner has earned a fairly good reputation and likely can be trusted.

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