Firefox invert PDF home-manager

README.md

Firefox invert PDF home-manager

Approch overview:

• By default PDF viewer will be inverted with hue-rotate(180deg) to retain colors.
• A JavaScript bookmarklet lets you invert back to light mode.

Put these lines in your config:

programs.firefox.your-profile = {
  userContent = ''
    #viewerContainer > #viewer.pdfViewer > .page {
      filter: invert(100%) hue-rotate(180deg);
    }
  '';

  bookmarks.settings = [{
    name = "Invert PDF";
    url = ''javascript:/*PDF%20-%20filter%20invert*/(function(){var%20L='style_PDFI',S='#viewerContainer>#viewer.pdfViewer>.page{filter:unset!important}',SS,E=document.querySelector('style[id="'+L+'"]');if(E){SS=E.disabled;E.disabled=(SS==true)?false:true}else{SS=document.createElement('style');SS.setAttribute('type','text/css');SS.id=L;SS.innerHTML=S;document.querySelector('head').appendChild(SS);}})()'';
  }];
}

Rebuild and restart firefox. Open any PDF in the browser, for example try this paper that I had open while writing this tutorial. To invert back to light mode click the Invert PDF bookmark.

Credits

• The solution by എല്ലാ മറുപടികളും to this mozilla support forum question is where I got the bookmarklet from.