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This article provides information about the changes in Firefox 86 that will affect developers. Firefox 86 is the current Nightly version of Firefox, and will ship on February 23, 2021.
Changes for web developers
Developer Tools
Removals
HTML
Removals
CSS
Removals
JavaScript
Removals
HTTP
Removals
Security
Removals
APIs
DOM
Media, WebRTC, and Web Audio
Removals
WebAssembly
Removals
Changes for add-on developers
Removals
Older versions
- 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
- Firefox 77 for developers
- Firefox 76 for developers
- Firefox 75 for developers
- Firefox 74 for developers
- Firefox 73 for developers
- Firefox 72 for developers
- Firefox 71 for developers
- Firefox 70 for developers
- Firefox 69 for developers
- Firefox 68 for developers
- Firefox 67 for developers
- Firefox 66 for developers
- Firefox 65 for developers
- Firefox 64 for developers
- Firefox 63 for developers
- Firefox 62 for developers
- Firefox 61 for developers
- Firefox 60 for developers
- Firefox 59 for developers
- Firefox 58 for developers
- Firefox 57 for developers
- Firefox 56 for developers
- Firefox 55 for developers