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Description of problem:
after I instaled firefox (it wasn't instaled by default as KDE was) I wanted to add it into dash panel. but firefox somehow hesitates to be added (no problem with Konqueror). What is even more starenge is that it completely disappears after changing order of any other icons :-)

You can see verything in video recorded. 

Version-Release number of selected component (if applicable):
gnome-shell-3.4.1-5.el7

How reproducible:
100%

Steps to Reproduce:
1.install firefox
2.go into activities->applications
3.add firefox into dash
4.try to move it to first place
  
Actual results:
firefox disappears

Expected results:
firefox in first place

Additional info:

Created attachment 591197 [details]
screen cast from gnome session

note:
this is not happening using F17

fedora bug that can be related:
https://bugzilla.redhat.com/show_bug.cgi?id=698817

and what more I think firefox icon should be there by default

*** Bug 841261 has been marked as a duplicate of this bug. ***

Works fine here with 3.6.1 - please test again.

it is not working well here with 
gnome-shell-3.6.2-6.el7.x86_64
firefox-17.0.1-2.el7.x86_64

it goes to the last position, cannot be moved and it disappears after g-s restart

If this issue is limited to Firefox, it is likely a duplicate of bug 826960.

*** This bug has been marked as a duplicate of bug 826960 ***