Does Firefox support enablePrivilege("UniversalBrowserRead")?

Question

I have written a plugin which queries webpage parameter from FireFox browser using NPAPI, but whenever I tried to query a webpage having iFrames, I'm getting error while trying to query the innerheight from my plugin:

permission denied to query innerHeight

I thought it would be cross-domain security rerstriction so I thought of running the following JavaScript code from my plugin using NPN_evaluate() function before querying information:

netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");

My question is does Firefox latest version support this JavaScript and will it allow me to query the information?

Answer 1

"UniversalBrowserRead" doesn't work anymore (see here) and support for enablePrivilege() will be removed.