message: Fix sticky file header tooltips
diff: @@ -64,6 +64,7 @@ import addQuickReviewButtons from './features/add-quick-review-buttons';
  import extendDiffExpander from './features/extend-diff-expander';
  import sortIssuesByUpdateTime from './features/sort-issues-by-update-time';
  import makeDiscussionSidebarSticky from './features/make-discussion-sidebar-sticky';
  +import makeHeadersSticky from './features/make-headers-sticky';
  import shortenLinks from './features/shorten-links';
  import waitForBuild from './features/wait-for-build';
  import addDownloadFolderButton from './features/add-download-folder-button';
  @@ -202,6 +203,7 @@ function ajaxedPagesHandler() {
  enableFeature(openAllSelected);
  enableFeature(hideUselessComments);
  enableFeature(navigatePagesWithArrowKeys);
  + enableFeature(makeHeadersSticky);
  if (pageDetect.isIssueSearch() || pageDetect.isPRSearch()) {
  enableFeature(addYoursMenuItem);
  