Light PDF Editing is coming to Firefox, currently available on Nightly


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Aug 17, 2014
Mozilla is working on improvements to Firefox's PDF Reader. Firefox will soon support light PDF editing tasks such as text or ink annotations.

The Firefox PDF Reader supports form filling, but that is the extent of its capabilities at this point. Mozilla has plans to improve the functionality of the built-in Firefox PDF Reader by adding light editing tools to it.

The following tools are included in the Firefox PDF Editor at the time of writing:
  • Text Annotation tool with options to change the font color and size.
  • Ink Annotation tool with options to change the link color and thickness.


Firefox PDF Editor​

The editor is in development currently, but Firefox Nightly users may enable it already to take it for a test ride.
  1. Load about:config in the Firefox address bar.
  2. Confirm that you accept the risk and want to continue.
  3. Search for pdfjs.annotationEditorMode and set the value of the preference to 0.
A restart of Firefox is not required. When you load a PDF document in Firefox now, regardless of whether it is a local PDF file or an online one, you find new editing options in the main toolbar.

firefox enable pdf editor

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