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--- a/browser/extensions/mortar/host/pdf/chrome/style/viewer.css
+++ b/browser/extensions/mortar/host/pdf/chrome/style/viewer.css
@@ -29,17 +29,17 @@ html {
   font-size: 10px;
   overflow: hidden;
 }
 
 body {
   height: 100%;
   width: 100%;
   background-color: #404040;
-  background-image: url(images/texture.png);
+  background-image: url(resource://pdf.js/web/images/texture.png);
   overflow: hidden;
 }
 
 body,
 input,
 button,
 select {
   font: message-box;
@@ -229,17 +229,17 @@ html[dir='rtl'] #viewerContainer {
 #toolbarContainer {
   width: 100%;
 }
 
 #toolbarSidebar {
   width: 200px;
   height: var(--toolbar-height);
   background-color: #424242; /* fallback */
-  background-image: url(images/texture.png),
+  background-image: url(resource://pdf.js/web/images/texture.png),
                     linear-gradient(hsla(0,0%,30%,.99), hsla(0,0%,25%,.95));
 }
 html[dir='ltr'] #toolbarSidebar {
   box-shadow: inset -1px 0 0 rgba(0, 0, 0, 0.25),
               inset 0 -1px 0 hsla(0,0%,100%,.05),
               0 1px 0 hsla(0,0%,0%,.15),
               0 0 1px hsla(0,0%,0%,.1);
 }
@@ -254,17 +254,17 @@ html[dir='rtl'] #toolbarSidebar {
   margin-left: 4px;
   display: inline-block;
 }
 
 #toolbarContainer, .findbar, .secondaryToolbar {
   position: relative;
   height: var(--toolbar-height);
   background-color: #474747; /* fallback */
-  background-image: url(images/texture.png),
+  background-image: url(resource://pdf.js/web/images/texture.png),
                     linear-gradient(hsla(0,0%,32%,.99), hsla(0,0%,27%,.95));
 }
 html[dir='ltr'] #toolbarContainer,
 html[dir='ltr'] .findbar,
 html[dir='ltr'] .secondaryToolbar,
 html[dir='ltr'] .polyfillDropdown {
   box-shadow: inset 1px 0 0 hsla(0,0%,100%,.08),
               inset 0 1px 1px hsla(0,0%,0%,.15),
@@ -368,30 +368,30 @@ html[dir='rtl'] .findbar {
   max-height: calc(100vh - var(--toolbar-height) - 10px);
   overflow-x: hidden;
   overflow-y: auto;
   transform: translateX(-1px);
   border: 1px solid hsla(0,0%,0%,.5);
   border-radius: 2px;
   box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
   background-color: #474747; /* fallback */
-  background-image: url(images/texture.png),
+  background-image: url(resource://pdf.js/web/images/texture.png),
                     linear-gradient(hsla(0,0%,32%,.99), hsla(0,0%,27%,.95));
   -moz-user-select: none;
 }
 
 .polyfillDropdown > .polyfillOption {
   min-width: 0;
   padding: 1px 6px;
   line-height: 18px;
   white-space: nowrap;
 }
 
 #findInput[data-status="pending"] {
-  background-image: url(images/loading-small.png);
+  background-image: url(resource://pdf.js/web/images/loading-small.png);
   background-repeat: no-repeat;
   background-position: right;
 }
 html[dir='rtl'] #findInput[data-status="pending"] {
   background-position: left;
 }
 
 .secondaryToolbar {
@@ -727,17 +727,17 @@ html[dir='rtl'] .dropdownToolbarButton {
               0 1px 0 hsla(0,0%,100%,.05);
 }
 
 .dropdownToolbarButton {
   width: 120px;
   max-width: 120px;
   padding: 0;
   overflow: hidden;
-  background: url(images/toolbarButton-menuArrows.png) no-repeat;
+  background: url(resource://pdf.js/web/images/toolbarButton-menuArrows.png) no-repeat;
 }
 html[dir='ltr'] .dropdownToolbarButton {
   background-position: 95%;
 }
 html[dir='rtl'] .dropdownToolbarButton {
   background-position: 5%;
 }
 
@@ -814,104 +814,104 @@ html[dir='rtl'] #findNext {
 html[dir="ltr"] .secondaryToolbarButton::before {
   left: 4px;
 }
 html[dir="rtl"] .secondaryToolbarButton::before {
   right: 4px;
 }
 
 html[dir='ltr'] .toolbarButton#sidebarToggle::before {
-  content: url(images/toolbarButton-sidebarToggle.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-sidebarToggle.png);
 }
 html[dir='rtl'] .toolbarButton#sidebarToggle::before {
-  content: url(images/toolbarButton-sidebarToggle-rtl.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-sidebarToggle-rtl.png);
 }
 
 html[dir='ltr'] .toolbarButton#secondaryToolbarToggle::before {
-  content: url(images/toolbarButton-secondaryToolbarToggle.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-secondaryToolbarToggle.png);
 }
 html[dir='rtl'] .toolbarButton#secondaryToolbarToggle::before {
-  content: url(images/toolbarButton-secondaryToolbarToggle-rtl.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-secondaryToolbarToggle-rtl.png);
 }
 
 html[dir='ltr'] .toolbarButton.findPrevious::before {
-  content: url(images/findbarButton-previous.png);
+  content: url(resource://pdf.js/web/images/findbarButton-previous.png);
 }
 html[dir='rtl'] .toolbarButton.findPrevious::before {
-  content: url(images/findbarButton-previous-rtl.png);
+  content: url(resource://pdf.js/web/images/findbarButton-previous-rtl.png);
 }
 
 html[dir='ltr'] .toolbarButton.findNext::before {
-  content: url(images/findbarButton-next.png);
+  content: url(resource://pdf.js/web/images/findbarButton-next.png);
 }
 html[dir='rtl'] .toolbarButton.findNext::before {
-  content: url(images/findbarButton-next-rtl.png);
+  content: url(resource://pdf.js/web/images/findbarButton-next-rtl.png);
 }
 
 html[dir='ltr'] .toolbarButton.pageUp::before {
-  content: url(images/toolbarButton-pageUp.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-pageUp.png);
 }
 html[dir='rtl'] .toolbarButton.pageUp::before {
-  content: url(images/toolbarButton-pageUp-rtl.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-pageUp-rtl.png);
 }
 
 html[dir='ltr'] .toolbarButton.pageDown::before {
-  content: url(images/toolbarButton-pageDown.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-pageDown.png);
 }
 html[dir='rtl'] .toolbarButton.pageDown::before {
-  content: url(images/toolbarButton-pageDown-rtl.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-pageDown-rtl.png);
 }
 
 .toolbarButton.zoomOut::before {
-  content: url(images/toolbarButton-zoomOut.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-zoomOut.png);
 }
 
 .toolbarButton.zoomIn::before {
-  content: url(images/toolbarButton-zoomIn.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-zoomIn.png);
 }
 
 .toolbarButton.presentationMode::before,
 .secondaryToolbarButton.presentationMode::before {
-  content: url(images/toolbarButton-presentationMode.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-presentationMode.png);
 }
 
 .toolbarButton.print::before,
 .secondaryToolbarButton.print::before {
-  content: url(images/toolbarButton-print.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-print.png);
 }
 
 .toolbarButton.download::before,
 .secondaryToolbarButton.download::before {
-  content: url(images/toolbarButton-download.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-download.png);
 }
 
 .toolbarButton.bookmark,
 .secondaryToolbarButton.bookmark {
   box-sizing: border-box;
   outline: none;
   padding-top: 4px;
   text-decoration: none;
 }
 .secondaryToolbarButton.bookmark {
   padding-top: 5px;
 }
 
 .toolbarButton.bookmark::before,
 .secondaryToolbarButton.bookmark::before {
-  content: url(images/toolbarButton-bookmark.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-bookmark.png);
 }
 html[dir="ltr"] #viewOutline.toolbarButton::before {
-  content: url(images/toolbarButton-viewOutline.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-viewOutline.png);
 }
 html[dir="rtl"] #viewOutline.toolbarButton::before {
-  content: url(images/toolbarButton-viewOutline-rtl.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-viewOutline-rtl.png);
 }
 
 #viewFind.toolbarButton::before {
-  content: url(images/toolbarButton-search.png);
+  content: url(resource://pdf.js/web/images/toolbarButton-search.png);
 }
 
 .secondaryToolbarButton {
   position: relative;
   margin: 0 0 4px 0;
   padding: 3px 0 1px 0;
   height: auto;
   min-height: 25px;
@@ -937,29 +937,29 @@ html[dir="rtl"] .secondaryToolbarButton.
 html[dir="ltr"] .secondaryToolbarButton > span {
   padding-right: 4px;
 }
 html[dir="rtl"] .secondaryToolbarButton > span {
   padding-left: 4px;
 }
 
 .secondaryToolbarButton.firstPage::before {
-  content: url(images/secondaryToolbarButton-firstPage.png);
+  content: url(resource://pdf.js/web/images/secondaryToolbarButton-firstPage.png);
 }
 
 .secondaryToolbarButton.lastPage::before {
-  content: url(images/secondaryToolbarButton-lastPage.png);
+  content: url(resource://pdf.js/web/images/secondaryToolbarButton-lastPage.png);
 }
 
 .secondaryToolbarButton.rotateCcw::before {
-  content: url(images/secondaryToolbarButton-rotateCcw.png);
+  content: url(resource://pdf.js/web/images/secondaryToolbarButton-rotateCcw.png);
 }
 
 .secondaryToolbarButton.rotateCw::before {
-  content: url(images/secondaryToolbarButton-rotateCw.png);
+  content: url(resource://pdf.js/web/images/secondaryToolbarButton-rotateCw.png);
 }
 
 .verticalToolbarSeparator {
   display: block;
   padding: 8px 0;
   margin: 8px 4px;
   width: 1px;
   background-color: hsla(0,0%,0%,.5);
@@ -1010,17 +1010,17 @@ html[dir='rtl'] .verticalToolbarSeparato
 .toolbarField.pageNumber {
   -moz-appearance: textfield; /* hides the spinner in moz */
   min-width: 16px;
   text-align: right;
   width: 40px;
 }
 
 .toolbarField.pageNumber.visiblePageIsLoading {
-  background-image: url(images/loading-small.png);
+  background-image: url(resource://pdf.js/web/images/loading-small.png);
   background-repeat: no-repeat;
   background-position: 1px;
 }
 
 .toolbarField:hover {
   background-color: hsla(0,0%,100%,.11);
   border-color: hsla(0,0%,0%,.4) hsla(0,0%,0%,.43) hsla(0,0%,0%,.45);
 }
@@ -1089,25 +1089,25 @@ html[dir='rtl'] .outlineItem > a {
 
 .outlineItemToggler {
   position: relative;
   height: 0;
   width: 0;
   color: hsla(0,0%,100%,.5);
 }
 .outlineItemToggler::before {
-  content: url(images/treeitem-expanded.png);
+  content: url(resource://pdf.js/web/images/treeitem-expanded.png);
   display: inline-block;
   position: absolute;
 }
 html[dir='ltr'] .outlineItemToggler.outlineItemsHidden::before {
-  content: url(images/treeitem-collapsed.png);
+  content: url(resource://pdf.js/web/images/treeitem-collapsed.png);
 }
 html[dir='rtl'] .outlineItemToggler.outlineItemsHidden::before {
-  content: url(images/treeitem-collapsed-rtl.png);
+  content: url(resource://pdf.js/web/images/treeitem-collapsed-rtl.png);
 }
 .outlineItemToggler.outlineItemsHidden ~ .outlineItems {
   display: none;
 }
 html[dir='ltr'] .outlineItemToggler {
   float: left;
 }
 html[dir='rtl'] .outlineItemToggler {
@@ -1214,17 +1214,17 @@ html[dir='rtl'] .outlineItemToggler::bef
 #overlayContainer > .container > .dialog {
   display: inline-block;
   padding: 15px;
   border-spacing: 4px;
   color: hsl(0,0%,85%);
   font-size: 12px;
   line-height: 14px;
   background-color: #474747; /* fallback */
-  background-image: url(images/texture.png),
+  background-image: url(resource://pdf.js/web/images/texture.png),
                     linear-gradient(hsla(0,0%,32%,.99), hsla(0,0%,27%,.95));
   box-shadow: inset 1px 0 0 hsla(0,0%,100%,.08),
               inset 0 1px 1px hsla(0,0%,0%,.15),
               inset 0 -1px 0 hsla(0,0%,100%,.05),
               0 1px 0 hsla(0,0%,0%,.15),
               0 1px 1px hsla(0,0%,0%,.1);
   border: 1px solid hsla(0,0%,0%,.5);
   border-radius: 4px;
@@ -1314,26 +1314,26 @@ html[dir='rtl'] .outlineItemToggler::bef
 #PDFBug .stats .title {
     font-weight: bold;
 }
 #PDFBug table {
   font-size: 10px;
 }
 
 .grab-to-pan-grab {
-  cursor: url("images/grab.cur"), move !important;
+  cursor: url("resource://pdf.js/web/images/grab.cur"), move !important;
   cursor: -moz-grab !important;
   cursor: grab !important;
 }
 .grab-to-pan-grab *:not(input):not(textarea):not(button):not(select):not(:link) {
   cursor: inherit !important;
 }
 .grab-to-pan-grab:active,
 .grab-to-pan-grabbing {
-  cursor: url("images/grabbing.cur"), move !important;
+  cursor: url("resource://pdf.js/web/images/grabbing.cur"), move !important;
   cursor: -moz-grabbing !important;
   cursor: grabbing !important;
 
   position: fixed;
   background: transparent;
   display: block;
   top: 0;
   left: 0;
@@ -1372,132 +1372,132 @@ html[dir='rtl'] .outlineItemToggler::bef
     left: -2px;
   }
   html[dir='rtl'] .secondaryToolbarButton::before {
     left: 186px;
   }
 
   .toolbarField.pageNumber.visiblePageIsLoading,
   #findInput[data-status="pending"] {
-    background-image: url(images/loading-small@2x.png);
+    background-image: url(resource://pdf.js/web/images/loading-small@2x.png);
     background-size: 16px 17px;
   }
 
   .dropdownToolbarButton {
-    background: url(images/toolbarButton-menuArrows@2x.png) no-repeat;
+    background: url(resource://pdf.js/web/images/toolbarButton-menuArrows@2x.png) no-repeat;
     background-size: 7px 16px;
   }
 
   html[dir='ltr'] .toolbarButton#sidebarToggle::before {
-    content: url(images/toolbarButton-sidebarToggle@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-sidebarToggle@2x.png);
   }
   html[dir='rtl'] .toolbarButton#sidebarToggle::before {
-    content: url(images/toolbarButton-sidebarToggle-rtl@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-sidebarToggle-rtl@2x.png);
   }
 
   html[dir='ltr'] .toolbarButton#secondaryToolbarToggle::before {
-    content: url(images/toolbarButton-secondaryToolbarToggle@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-secondaryToolbarToggle@2x.png);
   }
   html[dir='rtl'] .toolbarButton#secondaryToolbarToggle::before {
-    content: url(images/toolbarButton-secondaryToolbarToggle-rtl@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-secondaryToolbarToggle-rtl@2x.png);
   }
 
   html[dir='ltr'] .toolbarButton.findPrevious::before {
-    content: url(images/findbarButton-previous@2x.png);
+    content: url(resource://pdf.js/web/images/findbarButton-previous@2x.png);
   }
   html[dir='rtl'] .toolbarButton.findPrevious::before {
-    content: url(images/findbarButton-previous-rtl@2x.png);
+    content: url(resource://pdf.js/web/images/findbarButton-previous-rtl@2x.png);
   }
 
   html[dir='ltr'] .toolbarButton.findNext::before {
-    content: url(images/findbarButton-next@2x.png);
+    content: url(resource://pdf.js/web/images/findbarButton-next@2x.png);
   }
   html[dir='rtl'] .toolbarButton.findNext::before {
-    content: url(images/findbarButton-next-rtl@2x.png);
+    content: url(resource://pdf.js/web/images/findbarButton-next-rtl@2x.png);
   }
 
   html[dir='ltr'] .toolbarButton.pageUp::before {
-    content: url(images/toolbarButton-pageUp@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-pageUp@2x.png);
   }
   html[dir='rtl'] .toolbarButton.pageUp::before {
-    content: url(images/toolbarButton-pageUp-rtl@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-pageUp-rtl@2x.png);
   }
 
   html[dir='ltr'] .toolbarButton.pageDown::before {
-    content: url(images/toolbarButton-pageDown@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-pageDown@2x.png);
   }
   html[dir='rtl'] .toolbarButton.pageDown::before {
-    content: url(images/toolbarButton-pageDown-rtl@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-pageDown-rtl@2x.png);
   }
 
   .toolbarButton.zoomIn::before {
-    content: url(images/toolbarButton-zoomIn@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-zoomIn@2x.png);
   }
 
   .toolbarButton.zoomOut::before {
-    content: url(images/toolbarButton-zoomOut@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-zoomOut@2x.png);
   }
 
   .toolbarButton.presentationMode::before,
   .secondaryToolbarButton.presentationMode::before {
-    content: url(images/toolbarButton-presentationMode@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-presentationMode@2x.png);
   }
 
   .toolbarButton.print::before,
   .secondaryToolbarButton.print::before {
-    content: url(images/toolbarButton-print@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-print@2x.png);
   }
 
   .toolbarButton.download::before,
   .secondaryToolbarButton.download::before {
-    content: url(images/toolbarButton-download@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-download@2x.png);
   }
 
   .toolbarButton.bookmark::before,
   .secondaryToolbarButton.bookmark::before {
-    content: url(images/toolbarButton-bookmark@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-bookmark@2x.png);
   }
 
   html[dir="ltr"] #viewOutline.toolbarButton::before {
-    content: url(images/toolbarButton-viewOutline@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-viewOutline@2x.png);
   }
   html[dir="rtl"] #viewOutline.toolbarButton::before {
-    content: url(images/toolbarButton-viewOutline-rtl@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-viewOutline-rtl@2x.png);
   }
 
   #viewFind.toolbarButton::before {
-    content: url(images/toolbarButton-search@2x.png);
+    content: url(resource://pdf.js/web/images/toolbarButton-search@2x.png);
   }
 
   .secondaryToolbarButton.firstPage::before {
-    content: url(images/secondaryToolbarButton-firstPage@2x.png);
+    content: url(resource://pdf.js/web/images/secondaryToolbarButton-firstPage@2x.png);
   }
 
   .secondaryToolbarButton.lastPage::before {
-    content: url(images/secondaryToolbarButton-lastPage@2x.png);
+    content: url(resource://pdf.js/web/images/secondaryToolbarButton-lastPage@2x.png);
   }
 
   .secondaryToolbarButton.rotateCcw::before {
-    content: url(images/secondaryToolbarButton-rotateCcw@2x.png);
+    content: url(resource://pdf.js/web/images/secondaryToolbarButton-rotateCcw@2x.png);
   }
 
   .secondaryToolbarButton.rotateCw::before {
-    content: url(images/secondaryToolbarButton-rotateCw@2x.png);
+    content: url(resource://pdf.js/web/images/secondaryToolbarButton-rotateCw@2x.png);
   }
 
   .outlineItemToggler::before {
     transform: scale(0.5);
     top: -1px;
-    content: url(images/treeitem-expanded@2x.png);
+    content: url(resource://pdf.js/web/images/treeitem-expanded@2x.png);
   }
   html[dir='ltr'] .outlineItemToggler.outlineItemsHidden::before {
-    content: url(images/treeitem-collapsed@2x.png);
+    content: url(resource://pdf.js/web/images/treeitem-collapsed@2x.png);
   }
   html[dir='rtl'] .outlineItemToggler.outlineItemsHidden::before {
-    content: url(images/treeitem-collapsed-rtl@2x.png);
+    content: url(resource://pdf.js/web/images/treeitem-collapsed-rtl@2x.png);
   }
   html[dir='ltr'] .outlineItemToggler::before {
     right: 0;
   }
   html[dir='rtl'] .outlineItemToggler::before {
     left: 0;
   }
 }