PDF.js bookmarklet

getpdftext.js

var next = Promise.resolve();
var content = [];
for (var i = 1; i <= PDFView.pdfDocument.numPages; i++) {
  next = next.then(function (pageNum) {
    return PDFView.pdfDocument.getPage(pageNum).then(function (page) {
      return page.getTextContent().then(function (tc) {
        content.push((tc.items || tc).map(function (x) { return x.str; }).join(' '));
      }); 
    });    
  }.bind(null, i));
}
next.then(function () {
  var allText = content.join('\n\n');
  /* window.prompt('Text content', allText) */
  /* new DownloadManager().downloadData(new Blob([allText]), 'export.txt', 'text/plain'); */
  window.alert(allText);
}, function (reason) {
  window.alert('Error: ' + reason);
});

invert.js

function invertPage(canvas) {
  var ctx = canvas.getContext('2d');
  ctx.setTransform(1, 0, 0, 1, 0, 0);
  var pixels = ctx.getImageData(0, 0, canvas.width, canvas.height);
  var data = pixels.data;
  for (var i = 0, ii = data.length; i < ii; i+=4) {
    var r = data[i], g = data[i + 1], b = data[i + 2];
    var d = 255 - (Math.max(r, g, b) + Math.min(r, g, b));
    data[i] = r + d;
    data[i + 1] = g + d;
    data[i + 2] = b + d;
  }
  ctx.putImageData(pixels, 0, 0);
  canvas.style.backgroundColor = 'black';    
}
document.addEventListener('pagerender', function (e) {
  var pageNumber = e.detail.pageNumber;
  var page = PDFView.pages[pageNumber - 1];
  invertPage(page.canvas);
});
(function reset() {
  for (var i = 0, ii = PDFView.pages.length; i < ii; i++) {
    if (PDFView.pages[i].renderingState === RenderingStates.FINISHED) {
      invertPage(PDFView.pages[i].canvas);
    }
  }    
})();

slideshow.js

var waitInterval = 3000;
var lastPage = PDFView.page;
setTimeout(function next() {
  if (lastPage != PDFView.page) {
    return; /* user wants to control, cancelling*/
  }
  PDFView.page = ++lastPage;
  setTimeout(next, waitInterval);
}, waitInterval);

Bookmarklet for Firefox PDF Viewer and PDF.js addon. Also works for Chromium PDF.js extension.

http://ted.mielczarek.org/code/mozilla/bookmarklet.html to minimize