how to configure Firefox to only allow certain iframe access -

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in order modernize our old web application changed our frames iframes.

the web application runs ok change, errors occur.

today had chance users desktop , firefox (he has problems) via teamviewer (it's remote troubleshooting tool, it's similar having vnc session on remote desktop).

i installed firebug on remote firefox , tried log our web application.

in console found error line:

 permission denied access property "document".

after googling found out has iframes , sameorigin policy:

 http://davidwalsh.name/iframe-permission-denied  https://developer.mozilla.org/en-us/docs/web/http/x-frame-options

my question is:

the user has current firefox (version 38 or 39). did not have time ask him possible changes in settings. in short time had chance being @ firefox saw has lot of addons.

i have firefox 39 , not have problems iframes. there must setting or addon change.

can tell me change in firefox in order tighten security policies error?


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