--- a/browser/components/enterprisepolicies/Policies.jsm
+++ b/browser/components/enterprisepolicies/Policies.jsm
@@ -176,16 +176,24 @@ var Policies = {
   "DisableFormHistory": {
     onBeforeUIStartup(manager, param) {
       if (param) {
         setAndLockPref("browser.formfill.enable", false);
       }
     }
   },
 
+  "DisableBuiltinPDFViewer": {
+    onBeforeUIStartup(manager, param) {
+      if (param) {
+        manager.disallowFeature("PDFjs");
+      }
+    }
+  },
+
   "DisablePocket": {
     onBeforeAddons(manager, param) {
       if (param) {
         setAndLockPref("extensions.pocket.enabled", false);
       }
     }
   },
 

--- a/browser/components/enterprisepolicies/schemas/policies-schema.json
+++ b/browser/components/enterprisepolicies/schemas/policies-schema.json
@@ -137,16 +137,23 @@
 
     "DisableFormHistory": {
       "description": "Don't remember search and form history.",
       "first_available": "60.0",
 
       "type": "boolean"
     },
 
+    "DisableBuiltinPDFViewer": {
+      "description": "Disables PDF.js, which displays PDFs within Firefox.",
+      "first_available": "60.0",
+
+      "type": "boolean"
+    },
+
     "DisablePocket": {
       "description": "Prevents ability to save webpages to Pocket.",
       "first_available": "60.0",
 
       "type": "boolean"
     },
 
     "DisablePrivateBrowsing": {

--- a/browser/components/enterprisepolicies/tests/browser/browser.ini
+++ b/browser/components/enterprisepolicies/tests/browser/browser.ini
@@ -23,15 +23,16 @@ support-files =
 [browser_policy_block_set_desktop_background.js]
 [browser_policy_bookmarks.js]
 [browser_policy_clear_blocked_cookies.js]
 [browser_policy_default_browser_check.js]
 [browser_policy_disable_formhistory.js]
 [browser_policy_disable_fxaccounts.js]
 [browser_policy_disable_fxscreenshots.js]
 [browser_policy_disable_masterpassword.js]
+[browser_policy_disable_pdfjs.js]
 [browser_policy_disable_pocket.js]
 [browser_policy_disable_privatebrowsing.js]
 [browser_policy_disable_shield.js]
 [browser_policy_display_bookmarks.js]
 [browser_policy_display_menu.js]
 [browser_policy_remember_passwords.js]
 [browser_policy_set_homepage.js]

new file mode 100644
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/browser_policy_disable_pdfjs.js
@@ -0,0 +1,17 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+const {PdfJs} = ChromeUtils.import("resource://pdf.js/PdfJs.jsm", {});
+
+add_task(async function test_disable_pdfjs() {
+  is(PdfJs.enabled, true, "PDFjs should be enabled before policy runs");
+
+  await setupPolicyEngineWithJson({
+    "policies": {
+      "DisableBuiltinPDFViewer": true
+    }
+  });
+
+  is(PdfJs.enabled, false, "PDFjs should be disabled after policy runs");
+});

--- a/browser/extensions/pdfjs/content/PdfJs.jsm
+++ b/browser/extensions/pdfjs/content/PdfJs.jsm
@@ -332,16 +332,20 @@ var PdfJs = {
   },
 
   /**
    * pdf.js is only enabled if it is both selected as the pdf viewer and if the
    * global switch enabling it is true.
    * @return {boolean} Whether or not it's enabled.
    */
   get enabled() {
+    if (Services.policies && !Services.policies.isAllowed("PDFjs")) {
+      return false;
+    }
+
     if (!Services.prefs.getBoolPref(PREF_ENABLED_CACHE_INITIALIZED, false)) {
       // If we just updated, and the cache hasn't been initialized, then we
       // can't assume a default state, and need to synchronously initialize
       // PdfJs
       if (Services.prefs.prefHasUserValue(PREF_APP_UPDATE_POSTUPDATE)) {
         this.checkEnabled();
       }