diff --git a/4chan_x.user.js b/4chan_x.user.js
index a67c1bb2c..24c70ca1a 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -2873,15 +2873,15 @@
       return $.rm(thumb.nextSibling);
     },
     expand: function(thumb) {
-      var a, filesize, img, max, _, _ref;
+      var a, filesize, img, max;
       a = thumb.parentNode;
       img = $.el('img', {
         src: a.href
       });
       if (engine === 'gecko' && a.parentNode.className !== 'op') {
-        filesize = $('.filesize', a.parentNode);
-        _ref = filesize.textContent.match(/(\d+)x/), _ = _ref[0], max = _ref[1];
-        img.style.maxWidth = "" + max + "px";
+        filesize = $.x('preceding-sibling::span[@class="filesize"]', a).textContent;
+        max = filesize.match(/(\d+)x/);
+        img.style.maxWidth = "" + max[1] + "px";
       }
       $.on(img, 'error', imgExpand.error);
       thumb.hidden = true;
diff --git a/changelog b/changelog
index 66033bbdb..1f083a29e 100644
--- a/changelog
+++ b/changelog
@@ -1,6 +1,7 @@
 master
 - mayhem
   change 'Duckroll' for 'Cross-thread'
+  fix image expanding fitness with an inlined backlink on Firefox
 
 2.22.0
 - mayhem
diff --git a/script.coffee b/script.coffee
index 93124fa1d..ed2013b20 100644
--- a/script.coffee
+++ b/script.coffee
@@ -2208,9 +2208,9 @@ imgExpand =
     img = $.el 'img',
       src: a.href
     if engine is 'gecko' and a.parentNode.className isnt 'op'
-      filesize = $ '.filesize', a.parentNode
-      [_, max] = filesize.textContent.match /(\d+)x/
-      img.style.maxWidth = "#{max}px"
+      filesize = $.x('preceding-sibling::span[@class="filesize"]', a).textContent
+      max = filesize.match /(\d+)x/
+      img.style.maxWidth = "#{max[1]}px"
     $.on img, 'error', imgExpand.error
     thumb.hidden = true
     $.add a, img