AddonScreenshot

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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.

A screenshot object for an add-on can have following attributes.

Attributes

Attribute Type Description
url string The URL of the screenshot.
thumbnailURL Optional string The URL of a thumbnail version of the screenshot.
caption Optional string The caption of the screenshot.
width Optional string The width of the screenshot.
height Optional string The height of the screenshot.
thumbnailWidth Optional string the thumbnailWidth of the screenshot.
thumbnailHeight Optional string The thumbnailHeight of the screenshot.

 

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 Contributors to this page: wbamberg, bunnybooboo, maybe, Sheppy, ethertank, Mossop
 Last updated by: wbamberg,