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===Prefs that control ICE Candidate generation===
All of these can be set from about:config, or controlled via an extension
* '''media.peerconnection.ice.force_interface''' -- string (default "") -- interface name to match for ICE (Firefox 43, uplift requested for 42 and 41)-- {{Bug|1189040}}
** If set, and there is no interface that matches exactly, '''NO''' candidates will be generated
** If set and there is a match, that interface will be used solely for ICE. Local (LAN) and external IP addresses for that interface will be used for ICE candidates. This can be pointed at a single external interface to hide/ignore internal (VM) interfaces, unconnected interfaces or VPNs (e.g. work VPNs). It can also be set to a VPN interface, and then ICE will only use the VPN (and if the VPN is down, ICE will fail).
* '''media.peerconnection.ice.relay_only''' - boolean (default false) -- only generate relay (TURN) candidates for ICE (Firefox 42, uplift requested for 41)-- {{Bug|1189030}}
** This can be used to block all local (LAN) and external IP addresses from being generated as candidates.
** An example use-case would be avoiding exposing your external IP address to a caller (such as when avoiding disclosing you're in town Xxxxx when having a call with someone you have a protection order against; roughly the equivalent of blocking outgoing caller-id on the PSTN bug *-whatever)
** If set to false and '''media.peerconnection.default_iceservers''' is set to the server(s) you want to use, only those servers will be used, and no server provided by the page will be used.
** This can be useful for corporate 'gateway' TURN servers, or for a TURN server hosted by a VPN provider.
* '''media.peerconnection.ice.default_address_only''' -- boolean (default false) -- limit ICE candidates to the default interface only (Firefox 43, uplift requested for 42)-- {{Bug|1189041}}
** The default interface used for general routing is identified and only that address is used for candidate generation
** LAN IP addresses are not generated, the external IP address for that interface is (for a VPN, the exit portal of the VPN)
===Hooks to control access to createOffer/createAnswer===
Firefox 43 (uplift requested to 42) supports hooks that allow an extension to allow or deny calls to createOffer and createAnswer. -- {{Bug|1189060}}
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// Add-ons can override stock permission behavior by doing:
