Access Network Shared Folder SharePoint 2010

I could only work with only IE 7+. Firefox did not work for me.
Steps:
1. Add a Page Viewer Web Part to the page. (Locate “Media and Content” Categories when adding a webpart)
2. Click on “Open the tool pane”
3. In the tools pane, Select “Folder”
4. Point the Page Viewer Web Part to file://\\Servername\FolderName\
5. OK.