You know I was really going to write this article for my reference because it was about the few lines to add the “Sign in as a different user” again rather than searching & copying it from other posts every time I need it but I then stopped & thought…
But why the hell they removed it!!! It’s killing the developers & administrators are suffering!!
is this option uses an unsupported browser feature which is unreliable and causes other issues. Currently this option does not work in IE 10 and Safari.
Ok I didn’t write the reason, I copied it from here http://support.microsoft.com/kb/2752600 because actually after adding it, it works!
Now I am signing in as a different user, who has a contribute permission,
As below, I am checking that the user logging name changed and also more sure that this user is contribute from the menu, it’s obvious; just checking the caching problem, I don’t see it happening at all.
Check this article to add the “Sign in as a different user” https://www.nothingbutsharepoint.com/sites/itpro/Pages/Sign-in-as-a-Different-User-in-SharePoint-2013.aspx