Skip to content

Yomitan Permissions

  • <all_urls>
    Yomitan requires access to all URLs in order to run scripts to scan text and show the definitions popup, request audio for playback and download, and connect with Anki.

  • storage and unlimitedStorage
    Yomitan uses storage permissions in order to save extension settings and dictionary data. unlimitedStorage is used to help prevent web browsers from unexpectedly deleting dictionary data.

  • declarativeNetRequest
    Yomitan uses this permission to ensure certain requests have valid and secure headers. This sometimes involves removing or changing the Origin request header, as this can be used to fingerprint browser configuration.

  • scripting
    Yomitan needs to inject content scripts and stylesheets into webpages in order to properly display the search popup.

  • contextMenus
    Yomitan adds a context menu interface that lets you look up highlighted words.

  • offscreen (Chrome only)
    Yomitan uses this permission to create a secondary backend document that has DOM access, given that Manifest v3 service workers do not. Service workers can then reach out to out to this document in order to complete actions that require access to DOM APIs, such as any that require clipboard access.

  • clipboardWrite
    Yomitan supports simulating the Ctrl+C (copy to clipboard) keyboard shortcut when a definitions popup is open and focused.

  • clipboardRead (optional)
    Yomitan supports automatically opening a search window when Japanese text is copied to the clipboard while the browser is running, depending on how certain settings are configured. This allows Yomitan to support scanning text from external applications, provided there is a way to copy text from those applications to the clipboard.

  • nativeMessaging (optional, unavailable on Firefox for Android)
    Yomitan has the ability to communicate with an optional native messaging component in order to support parsing large blocks of Japanese text using MeCab. The installation of this component is optional and is not included by default.