Plugins are shared libraries that users can install to display content that the browser can't display natively. Important: plugins are a legacy technology that are a security and performance problem for Firefox users. They may not be supported in the future. New content should not be written using Flash or other plugin technology.
- Plugin Roadmap
- Information about the roadmap for Adobe Flash and other plugin support in Firefox.
- Since Firefox 52, plugins other than Flash are not loaded by Firefox.
- Starting in Firefox 55, users will be asked to choose which sites may use Flash content. This feature will be rolled out gradually to Firefox users.
- Also From Firefox 55 onwards, Flash and other plugins can no longer be loaded from any URL scheme except for http:// and https:// (bug 1335475). See also Flash can now be loaded only from HTTP/HTTPS for more useful information.
The articles below are developer information about the developing for click-to-play, and plugin blocking.
- Flash Activation: Browser Comparison
- Each browser activates Flash slightly differently, which can be confusing for users and web authors.
- Site Author Guide for Click-to-Activate Plugins
- Site authors still using Flash may should be aware of how Firefox activates plugins, in order to author compatible content.
- Plugin Blocking By Domain
- In order to improve security and performance for Firefox users, Firefox maintains a list of sites that are not able to use plugins.
- Archived Information
- Legacy documentation about developing NPAPI plugins.