Firefox 100 for developers
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This article provides information about the changes in Firefox 100 that will affect developers. Firefox 100 is the current Nightly version of Firefox and will ship on May 3, 2022.
Changes for web developers
Developer Tools
HTML
Removals
CSS
Removals
JavaScript
Removals
HTTP
Removals
- The non-standard
Large-Allocation
HTTP header has been removed (bug 1598759).
Security
Removals
APIs
WritableStream
,WritableStreamDefaultWriter
,WritableStreamDefaultController
, andReadableStream.pipeTo()
are now supported (bug 1759597).
DOM
Media, WebRTC, and Web Audio
Removals
WebAssembly
Removals
WebDriver conformance (Marionette)
Removals
Changes for add-on developers
Removals
Other
Older versions
- 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
- 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