diff --git a/toolkit/components/pdfjs/content/build/pdf.js b/toolkit/components/pdfjs/content/build/pdf.js
--- a/toolkit/components/pdfjs/content/build/pdf.js
+++ b/toolkit/components/pdfjs/content/build/pdf.js
@@ -1056,11 +1056,11 @@
     source.contentDispositionFilename = pdfDataRangeTransport.contentDispositionFilename;
   }
   const transfers = source.data ? [source.data.buffer] : null;
   const workerId = await worker.messageHandler.sendWithPromise("GetDocRequest", {
     docId,
-    apiVersion: '3.3.97',
+    apiVersion: '3.3.107',
     data: source.data,
     password: source.password,
     disableAutoFetch: source.disableAutoFetch,
     rangeChunkSize: source.rangeChunkSize,
     length: source.length,
@@ -2655,13 +2655,13 @@
         this.callback();
       }
     }
   }
 }
-const version = '3.3.97';
+const version = '3.3.107';
 exports.version = version;
-const build = 'edfdb693e';
+const build = '075cc8d8d';
 exports.build = build;
 
 /***/ }),
 /* 3 */
 /***/ ((__unused_webpack_module, exports, __w_pdfjs_require__) => {
@@ -13056,13 +13056,13 @@
 var _tools = __w_pdfjs_require__(5);
 var _annotation_layer = __w_pdfjs_require__(26);
 var _worker_options = __w_pdfjs_require__(14);
 var _svg = __w_pdfjs_require__(29);
 var _xfa_layer = __w_pdfjs_require__(28);
-const pdfjsVersion = '3.3.97';
-const pdfjsBuild = 'edfdb693e';
+const pdfjsVersion = '3.3.107';
+const pdfjsBuild = '075cc8d8d';
 })();
 
 /******/ 	return __webpack_exports__;
 /******/ })()
 ;
 });
\ No newline at end of file
diff --git a/toolkit/components/pdfjs/content/build/pdf.scripting.js b/toolkit/components/pdfjs/content/build/pdf.scripting.js
--- a/toolkit/components/pdfjs/content/build/pdf.scripting.js
+++ b/toolkit/components/pdfjs/content/build/pdf.scripting.js
@@ -580,24 +580,34 @@
     if (value === "") {
       this._value = "";
     } else if (typeof value === "string") {
       switch (this._fieldType) {
         case _common.FieldType.none:
-          this._value = !isNaN(value) ? parseFloat(value) : value;
-          break;
+          {
+            this._originalValue = value;
+            const _value = value.trim().replace(",", ".");
+            this._value = !isNaN(_value) ? parseFloat(_value) : value;
+            break;
+          }
         case _common.FieldType.number:
         case _common.FieldType.percent:
-          const number = parseFloat(value);
-          this._value = !isNaN(number) ? number : 0;
-          break;
+          {
+            const _value = value.trim().replace(",", ".");
+            const number = parseFloat(_value);
+            this._value = !isNaN(number) ? number : 0;
+            break;
+          }
         default:
           this._value = value;
       }
     } else {
       this._value = value;
     }
   }
+  _getValue() {
+    return this._originalValue ?? this.value;
+  }
   _setChoiceValue(value) {
     if (this.multipleSelection) {
       if (!Array.isArray(value)) {
         value = [value];
       }
@@ -2391,11 +2401,12 @@
   runValidation(source, event) {
     const didValidateRun = this.runActions(source, source, event, "Validate");
     if (event.rc) {
       source.obj.value = event.value;
       this.runCalculate(source, event);
-      const savedValue = event.value = source.obj.value;
+      const savedValue = source.obj._getValue();
+      event.value = source.obj.value;
       let formattedValue = null;
       if (this.runActions(source, source, event, "Format")) {
         formattedValue = event.value?.toString?.();
       }
       source.obj._send({
@@ -3655,11 +3666,11 @@
       obj[prop] = value;
       if (!this.nosend.has(prop) && obj._send && obj._id !== null && typeof old !== "function") {
         const data = {
           id: obj._id
         };
-        data[prop] = obj[prop];
+        data[prop] = prop === "value" ? obj._getValue() : obj[prop];
         if (!obj._siblings) {
           obj._send(data);
         } else {
           data.siblings = obj._siblings;
           obj._send(data);
@@ -4245,13 +4256,13 @@
   get: function () {
     return _initialization.initSandbox;
   }
 }));
 var _initialization = __w_pdfjs_require__(1);
-const pdfjsVersion = '3.3.97';
-const pdfjsBuild = 'edfdb693e';
+const pdfjsVersion = '3.3.107';
+const pdfjsBuild = '075cc8d8d';
 })();
 
 /******/ 	return __webpack_exports__;
 /******/ })()
 ;
 });
\ No newline at end of file
diff --git a/toolkit/components/pdfjs/content/build/pdf.worker.js b/toolkit/components/pdfjs/content/build/pdf.worker.js
--- a/toolkit/components/pdfjs/content/build/pdf.worker.js
+++ b/toolkit/components/pdfjs/content/build/pdf.worker.js
@@ -99,11 +99,11 @@
     const verbosity = (0, _util.getVerbosityLevel)();
     const {
       docId,
       apiVersion
     } = docParams;
-    const workerVersion = '3.3.97';
+    const workerVersion = '3.3.107';
     if (apiVersion !== workerVersion) {
       throw new Error(`The API version "${apiVersion}" does not match ` + `the Worker version "${workerVersion}".`);
     }
     const workerHandlerName = docId + "_worker";
     let handler = new _message_handler.MessageHandler(workerHandlerName, docId, port);
@@ -52415,13 +52415,13 @@
   get: function () {
     return _worker.WorkerMessageHandler;
   }
 }));
 var _worker = __w_pdfjs_require__(1);
-const pdfjsVersion = '3.3.97';
-const pdfjsBuild = 'edfdb693e';
+const pdfjsVersion = '3.3.107';
+const pdfjsBuild = '075cc8d8d';
 })();
 
 /******/ 	return __webpack_exports__;
 /******/ })()
 ;
 });
\ No newline at end of file
diff --git a/toolkit/components/pdfjs/content/web/viewer-geckoview.js b/toolkit/components/pdfjs/content/web/viewer-geckoview.js
--- a/toolkit/components/pdfjs/content/web/viewer-geckoview.js
+++ b/toolkit/components/pdfjs/content/web/viewer-geckoview.js
@@ -396,18 +396,17 @@
     delta = -delta;
   }
   return delta;
 }
 function normalizeWheelEventDelta(evt) {
+  const deltaMode = evt.deltaMode;
   let delta = normalizeWheelEventDirection(evt);
-  const MOUSE_DOM_DELTA_PIXEL_MODE = 0;
-  const MOUSE_DOM_DELTA_LINE_MODE = 1;
   const MOUSE_PIXELS_PER_LINE = 30;
   const MOUSE_LINES_PER_PAGE = 30;
-  if (evt.deltaMode === MOUSE_DOM_DELTA_PIXEL_MODE) {
+  if (deltaMode === WheelEvent.DOM_DELTA_PIXEL) {
     delta /= MOUSE_PIXELS_PER_LINE * MOUSE_LINES_PER_PAGE;
-  } else if (evt.deltaMode === MOUSE_DOM_DELTA_LINE_MODE) {
+  } else if (deltaMode === WheelEvent.DOM_DELTA_LINE) {
     delta /= MOUSE_LINES_PER_PAGE;
   }
   return delta;
 }
 function isValidRotation(angle) {
@@ -433,13 +432,15 @@
 }
 class ProgressBar {
   #classList = null;
   #disableAutoFetchTimeout = null;
   #percent = 0;
+  #style = null;
   #visible = true;
   constructor(bar) {
     this.#classList = bar.classList;
+    this.#style = bar.style;
   }
   get percent() {
     return this.#percent;
   }
   set percent(val) {
@@ -447,20 +448,20 @@
     if (isNaN(val)) {
       this.#classList.add("indeterminate");
       return;
     }
     this.#classList.remove("indeterminate");
-    docStyle.setProperty("--progressBar-percent", `${this.#percent}%`);
+    this.#style.setProperty("--progressBar-percent", `${this.#percent}%`);
   }
   setWidth(viewer) {
     if (!viewer) {
       return;
     }
     const container = viewer.parentNode;
     const scrollbarWidth = container.offsetWidth - viewer.offsetWidth;
     if (scrollbarWidth > 0) {
-      docStyle.setProperty("--progressBar-end-offset", `${scrollbarWidth}px`);
+      this.#style.setProperty("--progressBar-end-offset", `${scrollbarWidth}px`);
     }
   }
   setDisableAutoFetch(delay = 5000) {
     if (isNaN(this.#percent)) {
       return;
@@ -3016,29 +3017,29 @@
     supportsPinchToZoom
   } = PDFViewerApplication;
   if (pdfViewer.isInPresentationMode) {
     return;
   }
-  const isPinchToZoom = evt.ctrlKey && !PDFViewerApplication._isCtrlKeyDown;
+  const deltaMode = evt.deltaMode;
+  let scaleFactor = Math.exp(-evt.deltaY / 100);
+  const isPinchToZoom = evt.ctrlKey && !PDFViewerApplication._isCtrlKeyDown && deltaMode === WheelEvent.DOM_DELTA_PIXEL && evt.deltaX === 0 && Math.abs(scaleFactor - 1) < 0.05 && evt.deltaZ === 0;
   if (isPinchToZoom || evt.ctrlKey && supportedMouseWheelZoomModifierKeys.ctrlKey || evt.metaKey && supportedMouseWheelZoomModifierKeys.metaKey) {
     evt.preventDefault();
     if (zoomDisabledTimeout || document.visibilityState === "hidden") {
       return;
     }
     const previousScale = pdfViewer.currentScale;
     if (isPinchToZoom && supportsPinchToZoom) {
-      let scaleFactor = Math.exp(-evt.deltaY / 100);
       scaleFactor = PDFViewerApplication._accumulateFactor(previousScale, scaleFactor, "_wheelUnusedFactor");
       if (scaleFactor < 1) {
         PDFViewerApplication.zoomOut(null, scaleFactor);
       } else if (scaleFactor > 1) {
         PDFViewerApplication.zoomIn(null, scaleFactor);
       } else {
         return;
       }
     } else {
-      const deltaMode = evt.deltaMode;
       const delta = (0, _ui_utils.normalizeWheelEventDirection)(evt);
       let ticks = 0;
       if (deltaMode === WheelEvent.DOM_DELTA_LINE || deltaMode === WheelEvent.DOM_DELTA_PAGE) {
         if (Math.abs(delta) >= 1) {
           ticks = Math.sign(delta);
@@ -8178,11 +8179,11 @@
   #resizeObserver = new ResizeObserver(this.#resizeObserverCallback.bind(this));
   #scrollModePageState = null;
   #onVisibilityChange = null;
   #scaleTimeoutId = null;
   constructor(options) {
-    const viewerVersion = '3.3.97';
+    const viewerVersion = '3.3.107';
     if (_pdfjsLib.version !== viewerVersion) {
       throw new Error(`The API version "${_pdfjsLib.version}" does not match the Viewer version "${viewerVersion}".`);
     }
     this.container = options.container;
     this.viewer = options.viewer || options.container.firstElementChild;
@@ -12613,12 +12614,12 @@
 }));
 var _ui_utils = __webpack_require__(1);
 var _app_options = __webpack_require__(2);
 var _pdf_link_service = __webpack_require__(3);
 var _app = __webpack_require__(4);
-const pdfjsVersion = '3.3.97';
-const pdfjsBuild = 'edfdb693e';
+const pdfjsVersion = '3.3.107';
+const pdfjsBuild = '075cc8d8d';
 const AppConstants = null;
 exports.PDFViewerApplicationConstants = AppConstants;
 window.PDFViewerApplication = _app.PDFViewerApplication;
 window.PDFViewerApplicationConstants = AppConstants;
 window.PDFViewerApplicationOptions = _app_options.AppOptions;
diff --git a/toolkit/components/pdfjs/content/web/viewer.css b/toolkit/components/pdfjs/content/web/viewer.css
--- a/toolkit/components/pdfjs/content/web/viewer.css
+++ b/toolkit/components/pdfjs/content/web/viewer.css
@@ -1074,12 +1074,10 @@
   --toolbar-icon-opacity: 0.7;
   --doorhanger-icon-opacity: 0.9;
 
   --main-color: rgba(12, 12, 13, 1);
   --body-bg-color: rgba(212, 212, 215, 1);
-  --progressBar-percent: 0%;
-  --progressBar-end-offset: 0;
   --progressBar-color: rgba(10, 132, 255, 1);
   --progressBar-bg-color: rgba(221, 221, 222, 1);
   --progressBar-blend-color: rgba(116, 177, 239, 1);
   --scrollbar-color: auto;
   --scrollbar-bg-color: auto;
@@ -1414,10 +1412,15 @@
 #toolbarViewer {
   height: 32px;
 }
 
 #loadingBar {
+  /* Define these variables here, and not in :root, to avoid reflowing the
+     entire viewer when updating progress (see issue 15958). */
+  --progressBar-percent: 0%;
+  --progressBar-end-offset: 0;
+
   position: absolute;
   inset-inline: 0 var(--progressBar-end-offset);
   height: 4px;
   background-color: var(--progressBar-bg-color);
   border-bottom: 1px solid var(--toolbar-border-color);
diff --git a/toolkit/components/pdfjs/content/web/viewer.js b/toolkit/components/pdfjs/content/web/viewer.js
--- a/toolkit/components/pdfjs/content/web/viewer.js
+++ b/toolkit/components/pdfjs/content/web/viewer.js
@@ -396,18 +396,17 @@
     delta = -delta;
   }
   return delta;
 }
 function normalizeWheelEventDelta(evt) {
+  const deltaMode = evt.deltaMode;
   let delta = normalizeWheelEventDirection(evt);
-  const MOUSE_DOM_DELTA_PIXEL_MODE = 0;
-  const MOUSE_DOM_DELTA_LINE_MODE = 1;
   const MOUSE_PIXELS_PER_LINE = 30;
   const MOUSE_LINES_PER_PAGE = 30;
-  if (evt.deltaMode === MOUSE_DOM_DELTA_PIXEL_MODE) {
+  if (deltaMode === WheelEvent.DOM_DELTA_PIXEL) {
     delta /= MOUSE_PIXELS_PER_LINE * MOUSE_LINES_PER_PAGE;
-  } else if (evt.deltaMode === MOUSE_DOM_DELTA_LINE_MODE) {
+  } else if (deltaMode === WheelEvent.DOM_DELTA_LINE) {
     delta /= MOUSE_LINES_PER_PAGE;
   }
   return delta;
 }
 function isValidRotation(angle) {
@@ -433,13 +432,15 @@
 }
 class ProgressBar {
   #classList = null;
   #disableAutoFetchTimeout = null;
   #percent = 0;
+  #style = null;
   #visible = true;
   constructor(bar) {
     this.#classList = bar.classList;
+    this.#style = bar.style;
   }
   get percent() {
     return this.#percent;
   }
   set percent(val) {
@@ -447,20 +448,20 @@
     if (isNaN(val)) {
       this.#classList.add("indeterminate");
       return;
     }
     this.#classList.remove("indeterminate");
-    docStyle.setProperty("--progressBar-percent", `${this.#percent}%`);
+    this.#style.setProperty("--progressBar-percent", `${this.#percent}%`);
   }
   setWidth(viewer) {
     if (!viewer) {
       return;
     }
     const container = viewer.parentNode;
     const scrollbarWidth = container.offsetWidth - viewer.offsetWidth;
     if (scrollbarWidth > 0) {
-      docStyle.setProperty("--progressBar-end-offset", `${scrollbarWidth}px`);
+      this.#style.setProperty("--progressBar-end-offset", `${scrollbarWidth}px`);
     }
   }
   setDisableAutoFetch(delay = 5000) {
     if (isNaN(this.#percent)) {
       return;
@@ -3020,29 +3021,29 @@
     supportsPinchToZoom
   } = PDFViewerApplication;
   if (pdfViewer.isInPresentationMode) {
     return;
   }
-  const isPinchToZoom = evt.ctrlKey && !PDFViewerApplication._isCtrlKeyDown;
+  const deltaMode = evt.deltaMode;
+  let scaleFactor = Math.exp(-evt.deltaY / 100);
+  const isPinchToZoom = evt.ctrlKey && !PDFViewerApplication._isCtrlKeyDown && deltaMode === WheelEvent.DOM_DELTA_PIXEL && evt.deltaX === 0 && Math.abs(scaleFactor - 1) < 0.05 && evt.deltaZ === 0;
   if (isPinchToZoom || evt.ctrlKey && supportedMouseWheelZoomModifierKeys.ctrlKey || evt.metaKey && supportedMouseWheelZoomModifierKeys.metaKey) {
     evt.preventDefault();
     if (zoomDisabledTimeout || document.visibilityState === "hidden") {
       return;
     }
     const previousScale = pdfViewer.currentScale;
     if (isPinchToZoom && supportsPinchToZoom) {
-      let scaleFactor = Math.exp(-evt.deltaY / 100);
       scaleFactor = PDFViewerApplication._accumulateFactor(previousScale, scaleFactor, "_wheelUnusedFactor");
       if (scaleFactor < 1) {
         PDFViewerApplication.zoomOut(null, scaleFactor);
       } else if (scaleFactor > 1) {
         PDFViewerApplication.zoomIn(null, scaleFactor);
       } else {
         return;
       }
     } else {
-      const deltaMode = evt.deltaMode;
       const delta = (0, _ui_utils.normalizeWheelEventDirection)(evt);
       let ticks = 0;
       if (deltaMode === WheelEvent.DOM_DELTA_LINE || deltaMode === WheelEvent.DOM_DELTA_PAGE) {
         if (Math.abs(delta) >= 1) {
           ticks = Math.sign(delta);
@@ -8187,11 +8188,11 @@
   #resizeObserver = new ResizeObserver(this.#resizeObserverCallback.bind(this));
   #scrollModePageState = null;
   #onVisibilityChange = null;
   #scaleTimeoutId = null;
   constructor(options) {
-    const viewerVersion = '3.3.97';
+    const viewerVersion = '3.3.107';
     if (_pdfjsLib.version !== viewerVersion) {
       throw new Error(`The API version "${_pdfjsLib.version}" does not match the Viewer version "${viewerVersion}".`);
     }
     this.container = options.container;
     this.viewer = options.viewer || options.container.firstElementChild;
@@ -12772,12 +12773,12 @@
 }));
 var _ui_utils = __webpack_require__(1);
 var _app_options = __webpack_require__(2);
 var _pdf_link_service = __webpack_require__(3);
 var _app = __webpack_require__(4);
-const pdfjsVersion = '3.3.97';
-const pdfjsBuild = 'edfdb693e';
+const pdfjsVersion = '3.3.107';
+const pdfjsBuild = '075cc8d8d';
 const AppConstants = null;
 exports.PDFViewerApplicationConstants = AppConstants;
 window.PDFViewerApplication = _app.PDFViewerApplication;
 window.PDFViewerApplicationConstants = AppConstants;
 window.PDFViewerApplicationOptions = _app_options.AppOptions;
diff --git a/toolkit/components/pdfjs/moz.yaml b/toolkit/components/pdfjs/moz.yaml
--- a/toolkit/components/pdfjs/moz.yaml
+++ b/toolkit/components/pdfjs/moz.yaml
@@ -18,12 +18,12 @@
   # Usually different from repository url
   url: https://github.com/mozilla/pdf.js
 
   # Human-readable identifier for this version/release
   # Generally "version NNN", "tag SSS", "bookmark SSS"
-  release: edfdb693e5b11057252f8cef9388d063678d95cd (2023-01-21T13:02:40Z).
-  revision: edfdb693e5b11057252f8cef9388d063678d95cd
+  release: 075cc8d8dfa182c9f9ab95273e9e1c90002c535b (2023-01-26T15:10:29Z).
+  revision: 075cc8d8dfa182c9f9ab95273e9e1c90002c535b
 
   # The package's license, where possible using the mnemonic from
   # https://spdx.org/licenses/
   # Multiple licenses can be specified (as a YAML list)
   # A "LICENSE" file must exist containing the full license text