Add-ons using the techniques described in this document are considered a legacy technology in Firefox. Don't use these techniques to develop new add-ons. Use WebExtensions instead. If you maintain an add-on which uses the techniques described here, consider migrating it to use WebExtensions.

Starting from Firefox 53, no new legacy add-ons will be accepted on addons.mozilla.org (AMO) for desktop Firefox and Firefox for Android.

Starting from Firefox 57, only extensions developed using WebExtensions APIs will be supported on Desktop Firefox and Firefox for Android.

Even before Firefox 57, changes coming up in the Firefox platform will break many legacy extensions. These changes include multiprocess Firefox (e10s), sandboxing, and multiple content processes. Legacy extensions that are affected by these changes should migrate to use WebExtensions APIs if they can. See the "Compatibility Milestones" document for more information.

A wiki page containing resources, migration paths, office hours, and more, is available to help developers transition to the new technologies.

Unstable

Data encoding and decoding using Base64 algorithms.

var base64 = require("sdk/base64");
 
var encodedData = base64.encode("Hello, World");
var decodedData = base64.decode(encodedData);

Globals

Functions

encode(data, charset)

Creates a base-64 encoded ASCII string from a string of binary data.

Parameters

data : string
The data to encode

charset : string
The charset of the string to encode (optional). The only accepted value is "utf-8". In order to encode and decode Unicode strings, the charset parameter needs to be set:

var base64 = require("sdk/base64");

var encodedData = base64.encode(unicodeString, "utf-8");
Returns

string : The encoded string

decode(data, charset)

Decodes a string of data which has been encoded using base-64 encoding.

Parameters

data : string
The encoded data

charset : string
The charset of the string to encode (optional). The only accepted value is "utf-8". In order to encode and decode Unicode strings, the charset parameter needs to be set:

var base64 = require("sdk/base64");

var decodedData = base64.decode(encodedData, "utf-8");
Returns

string : The decoded string

Document Tags and Contributors

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 Contributors to this page: wbamberg
 Last updated by: wbamberg,