Firefox 109 for developers
This article provides information about the changes in Firefox 109 that will affect developers. Firefox 109 is the current Nightly version of Firefox and will ship on January 17, 2023.
Changes for web developers
Developer Tools
HTML
Removals
CSS
Removals
JavaScript
Removals
HTTP
Removals
Security
Removals
APIs
DOM
Media, WebRTC, and Web Audio
Removals
WebAssembly
Removals
WebDriver conformance (WebDriver BiDi, Marionette)
WebDriver BiDi
Marionette
Changes for add-on developers
Removals
Other
Older versions
- Firefox 108 for developers
- Firefox 107 for developers
- Firefox 106 for developers
- Firefox 105 for developers
- Firefox 104 for developers
- Firefox 103 for developers
- Firefox 102 for developers
- Firefox 101 for developers
- Firefox 100 for developers
- Firefox 99 for developers
- Firefox 98 for developers
- Firefox 97 for developers
- Firefox 96 for developers
- Firefox 95 for developers
- Firefox 94 for developers
- Firefox 93 for developers
- Firefox 92 for developers
- Firefox 91 for developers
- Firefox 90 for developers
- Firefox 89 for developers
- Firefox 88 for developers
- Firefox 87 for developers
- Firefox 86 for developers
- Firefox 85 for developers
- Firefox 84 for developers
- Firefox 83 for developers
- Firefox 82 for developers
- Firefox 81 for developers
- Firefox 80 for developers
- Firefox 79 for developers
- Firefox 78 for developers