In Chrome: An extension can register a PAC file, but can also define explicit proxying rules.īecause this API is incompatible with Chrome's proxy API, the Firefox proxy API is only available through the browser namespace.In Firefox: An extension can register a PAC file.Waiting to make subsequent calls until within the () callback function is not a sufficient delay to prevent this.įirefox's proxy API followed a completely different design from Chrome's Proxy API. In Firefox: In Firefox, the notifications may not display at all.If you call notifications.create() more than once in rapid succession: In Firefox: The notification is cleared immediately.Notifications APIįor notifications.create(), with type 'basic': The rest of this section describes compatibility issues that are not already captured in the tables. These tables are generated from compatibility data stored as JSON files in GitHub.

Where there are caveats around support for a given API item, this is indicated in these tables with an asterisk '*' and in the reference page for the API item, the caveats are explained. The page Browser support for JavaScript APIs includes compatibility tables for all APIs that have any support in Firefox. The rest of this page summarizes these and other incompatibilities. In Chrome and Edge: Asynchronous APIs are implemented using callbacks.In Firefox: Asynchronous APIs are implemented using promises.In Chrome: JavaScript APIs are accessed under the chrome namespace.In Firefox and Edge: JavaScript APIs are accessed under the browser namespace.See the 'Browser compatibility' section in the manifest.json page for more details. Support for manifest.json keys differs across browsers.See Browser support for JavaScript APIs for more details. Support for JavaScript APIs differs across browsers.However, there are significant differences between Chrome, Firefox, and Edge. As far as possible, extensions written for those browsers should run on Firefox with minimal changes. Differences between API implementationsĮxtensions built with WebExtension APIs are designed to be compatible with Chrome and Opera extensions.

Firefox os x compatibility