testNotebookTheme
Theme using a PNG (notebook page layers) as the theme_frame image, employing a faded edge. See https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Examples#themes
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Theme using a PNG (notebook page layers) as the theme_frame image, employing a faded edge. See https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Examples#themes