Firefox 66 for developers

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This article provides information about the changes in Firefox 66 that will affect developers. Firefox 66 is the current Nightly version of Firefox, and will ship on March 19, 2019.

Changes for web developers

Developer tools

No changes.

Removals

HTML

  • UTF-8-encoded HTML (and plain text) files loaded from file: URLs are now supported without <meta charset=utf-8> or the UTF-8 BOM making it easier to work on such files locally before uploading them to a server. You still need to make sure that the server sends charset=utf-8 in the Content-Type HTTP header for such files. (The detection mechanism used for local files would break incremental loading in the network case.) (bug 1071816)

Removals

CSS

Removals

SVG

No changes.

Removals

JavaScript

No changes.

Removals

APIs

No changes.

New APIs

DOM

DOM events

Service workers

Media, Web Audio, and WebRTC

Canvas and WebGL

Removals

Security

No changes.

Removals

Plugins

No changes.

Removals

Other

No changes.

Removals

Changes for add-on developers

API changes

No changes.

Removals

Manifest changes

No changes.

Removals

See also

Older versions

Document Tags and Contributors

Contributors to this page: quasicomputational, yisibl, ExE-Boss, Hsivonen, chrisdavidmills
Last updated by: quasicomputational,