Backed out changeset 5d2f312603d7 (bug 1943454) for causing bc failures @browser_pdfjs_stamp_telemetry.js.

Author: Goloman Adrian

toolkit/components/pdfjs/PdfJsOverridePrefs.js

@@ -20,8 +20,6 @@
 
 #else
 
-  pref("pdfjs.enableUpdatedAddImage", true);
-
   #if defined(EARLY_BETA_OR_EARLIER)
     pref("pdfjs.enableHighlightFloatingButton", true);