--- a/devtools/server/actors/accessibility.js
+++ b/devtools/server/actors/accessibility.js
@@ -320,17 +320,17 @@ const AccessibleActor = ActorClassWithSp
 
   get bounds() {
     if (this.isDefunct) {
       return null;
     }
 
     let x = {}, y = {}, w = {}, h = {};
     try {
-      this.rawAccessible.getBounds(x, y, w, h);
+      this.rawAccessible.getBoundsInCSSPixels(x, y, w, h);
       x = x.value;
       y = y.value;
       w = w.value;
       h = h.value;
     } catch (e) {
       return null;
     }
 

--- a/devtools/server/actors/highlighters/utils/accessibility.js
+++ b/devtools/server/actors/highlighters/utils/accessibility.js
@@ -21,29 +21,29 @@ const { getCurrentZoom } = require("devt
  *         - {Number} w
  *           width of the the accessible object
  *         - {Number} h
  *           height of the the accessible object
  * @return {Object|null} Returns, if available, positioning and bounds information for
  *                 the accessible object.
  */
 function getBounds(win, { x, y, w, h }) {
-  let { devicePixelRatio, mozInnerScreenX, mozInnerScreenY, scrollX, scrollY } = win;
+  let { mozInnerScreenX, mozInnerScreenY, scrollX, scrollY } = win;
   let zoom = getCurrentZoom(win);
   let left = x, right = x + w, top = y, bottom = y + h;
 
-  left -= (mozInnerScreenX - scrollX) * devicePixelRatio;
-  right -= (mozInnerScreenX - scrollX) * devicePixelRatio;
-  top -= (mozInnerScreenY - scrollY) * devicePixelRatio;
-  bottom -= (mozInnerScreenY - scrollY) * devicePixelRatio;
+  left -= mozInnerScreenX - scrollX;
+  right -= mozInnerScreenX - scrollX;
+  top -= mozInnerScreenY - scrollY;
+  bottom -= mozInnerScreenY - scrollY;
 
-  left *= zoom / devicePixelRatio;
-  right *= zoom / devicePixelRatio;
-  top *= zoom / devicePixelRatio;
-  bottom *= zoom / devicePixelRatio;
+  left *= zoom;
+  right *= zoom;
+  top *= zoom;
+  bottom *= zoom;
 
   let width = right - left;
   let height = bottom - top;
 
   return { left, right, top, bottom, width, height };
 }
 
 exports.getBounds = getBounds;