diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -384,7 +384,6 @@
     'rsrc/js/application/diffusion/behavior-audit-preview.js' => 'd835b03a',
     'rsrc/js/application/diffusion/behavior-commit-branches.js' => 'bdaf4d04',
     'rsrc/js/application/diffusion/behavior-commit-graph.js' => '75b83cbb',
-    'rsrc/js/application/diffusion/behavior-diffusion-browse-file.js' => '054a0f0b',
     'rsrc/js/application/diffusion/behavior-locate-file.js' => '6d3e1947',
     'rsrc/js/application/diffusion/behavior-pull-lastmodified.js' => 'f01586dc',
     'rsrc/js/application/doorkeeper/behavior-doorkeeper-tag.js' => '1db13e70',
@@ -597,7 +596,6 @@
     'javelin-behavior-differential-feedback-preview' => '51c5ad07',
     'javelin-behavior-differential-populate' => '419998ab',
     'javelin-behavior-differential-user-select' => 'a8d8459d',
-    'javelin-behavior-diffusion-browse-file' => '054a0f0b',
     'javelin-behavior-diffusion-commit-branches' => 'bdaf4d04',
     'javelin-behavior-diffusion-commit-graph' => '75b83cbb',
     'javelin-behavior-diffusion-locate-file' => '6d3e1947',
@@ -932,12 +930,6 @@
       'javelin-util',
       'javelin-magical-init',
     ),
-    '054a0f0b' => array(
-      'javelin-behavior',
-      'javelin-dom',
-      'javelin-util',
-      'phabricator-tooltip',
-    ),
     '065227cc' => array(
       'javelin-behavior',
       'javelin-dom',
diff --git a/webroot/rsrc/js/application/diffusion/behavior-diffusion-browse-file.js b/webroot/rsrc/js/application/diffusion/behavior-diffusion-browse-file.js
deleted file mode 100644
--- a/webroot/rsrc/js/application/diffusion/behavior-diffusion-browse-file.js
+++ /dev/null
@@ -1,47 +0,0 @@
-/**
- * @provides javelin-behavior-diffusion-browse-file
- * @requires javelin-behavior
- *           javelin-dom
- *           javelin-util
- *           phabricator-tooltip
- */
-
-JX.behavior('diffusion-browse-file', function(config, statics) {
-  if (statics.installed) {
-    return;
-  }
-  statics.installed = true;
-
-  var map = config.labels;
-
-  JX.Stratcom.listen(
-    ['mouseover', 'mouseout'],
-    ['phabricator-source', 'tag:td'],
-    function(e) {
-      var target = e.getTarget();
-
-      // NOTE: We're using raw classnames instead of sigils and metadata here
-      // because these elements are unusual: there are a lot of them on the
-      // page, and rendering all the extra metadata to do this in a normal way
-      // would be needlessly expensive. This is an unusual case.
-
-      if (!target.className.match(/cov-/)) {
-        return;
-      }
-
-      if (e.getType() == 'mouseout') {
-        JX.Tooltip.hide();
-        return;
-      }
-
-      for (var k in map) {
-        if (!target.className.match(k)) {
-          continue;
-        }
-
-        var label = map[k];
-        JX.Tooltip.show(target, 300, 'E', label);
-        break;
-      }
-    });
-});