Setting plugin activation state from addons

Hi,

some plugins are delivered to Firefox via XPIs. If you do that, you can add
per-site or global permissions for your plugin and don’t require any white-
listing.

While we don’t have docs yet on the subject, here is an outline i put on bug
982028:

For adding the permissions (per site, preferred if possible) you would use
nsIPermissionManager.add() for every mimetype [1].
* for the type param use nsIPluginManager.getPermissionStringForType().
* the permission param should be Ci.nsIPermissionManager.ALLOW_ACTION
* expire type Ci.nsIPermissionManager.EXPIRE_NEVER or
  Ci.nsIPermissionManager.EXPIRE_TIME

You can see similar usage to that in our click-to-play code and check permissions.sqlite
in your profile folder [2].

Globally activating (avoid if possible to reduce exposure) a plugin would be done via
prefs, you can check about:config and filter for "plugin.state." for comparison.


Georg


[1] https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/nsIPermissionManager#add%28%29
[2] http://hg.mozilla.org//mozilla-central/annotate/67485526e241/browser/base/content/browser-plugins.js#l729