B2G/gecko/browser/components/tabview/modules/utils.jsm
// recently used entry which matches the filter.
recently used entry which matches the filter.
recently used entry which matches the filter .
function MRUList_peek(filter) {
    let match = null;
    if (filter && typeof filter == "function")
      this._list.some(function MRUList_peek_getEntry(entry) {
        if (filter(entry)) {
          match = entry
          return true;
        }
        return false;
      });
    else 
      match = this._list.length > 0 ? this._list[0] : null;
    return match;
  }
function MRUList_peek ( filter ) { let match = null ; if ( filter && typeof filter == "function" ) this . _list . some ( function MRUList_peek_getEntry ( entry ) { if ( filter ( entry ) ) { match = entry return true ; } return false ; } ) ; else match = this . _list . length > 0 ? this . _list [ 0 ] : null ; return match ; }
recently used entry which matches the filter.
recently used entry which matches the filter .