Controlling Privacy Features


You must declare the privacy permission in your extension’s manifest to use the Privacy API. For example:

	"name": "My extension",
	"permissions": [


Reading the current value of an Opera setting is straightforward. You’ll first need to find the property you’re interested in, then you’ll call get() on that object in order to retrieve its current value and your extension’s level of control. For example, to determine if the browser’s autofill feature is enabled, you’d write:{}, function(details) {
	if (details.value) {
		console.log('Autofill is on!');
	} else {
		console.log('Autofill is off!');

Changing the value of a setting is a little bit more complex, simply because you first must verify that your extension can control the setting. The user won’t see any change to her settings if your extension toggles a setting that is either locked to a specific value by enterprise policies (levelOfControl will be set to not_controllable), or if another extension is controlling the value (levelOfControl will be set to controlled_by_other_extensions). The set() call will succeed, but the setting will be immediately overridden. As this might be confusing, it is advisable to warn the user when the settings they’ve chosen aren’t practically applied.

This means that you ought to use the get() method to determine your level of access, and then only call set() if your extension can grab control over the setting (in fact if your extension can’t control the setting it’s probably a good idea to visually disable the functionality to reduce user confusion):{}, function(details) {
	if (details.levelOfControl === 'controllable_by_this_extension') {{ value: true }, function() {
			if (chrome.runtime.lastError === undefined) {
				console.log('Hooray, it worked!');
			} else {
				console.log('Sadness!', chrome.runtime.lastError);

If you’re interested in changes to a setting’s value, add a listener to its onChange event. Among other uses, this will allow you to warn the user if a more recently installed extension grabs control of a setting, or if enterprise policy overrides your control. To listen for changes to autofill’s status, for example, the following code would suffice:
	function (details) {
		// …

The new value is stored in details.value, the new level of control in details.levelOfControl, and details.incognitoSpecific will be true if the value is specific to incognito mode.

Note: Full details about extensions’ ability to control settings can be found under chrome.types.ChromeSetting. Also check out the properties of to see which features the privacy API controls.