How can I add the CSS styles used by Firefox player mode?

When loading from the view of the reader, the text is aligned to the left by default. I would like to be well to the left and right justified. At present, I can arrange this by editing the css style in the view "Inspect element", but it's not permanent (and we don't know where the player load css style). Is there a way to make such a change in the permanent reader view css style?

See also:

  • chrome://global/skin/aboutReaderControls.CSS
  • chrome://global/skin/aboutReaderContent.CSS

The main switch is #moz - player - content

Tags: Firefox

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