Firefox 73 for developers

This article provides information about the changes in Firefox 73 that will affect developers. Firefox 73 was released on February 11, 2020.

Changes for web developers

Developer tools

HTML

No changes.

CSS

Removals

SVG

MathML

Removals

JavaScript

APIs

DOM

  • The innerWidth and innerHeight properties on Window objects have been updated to return the width and height of the layout viewport in all situations, rather than sometimes being based on the visual viewport. In particular, previously when using Responsive Design Mode, these returned the visual viewport dimensions, causing the behavior to vary from what was expected (bug 1514429).

WebVR

Removals

Security

No changes.

WebDriver conformance (Marionette)

  • Added WebDriver:Print to print the current page as a PDF document (bug 1604506).
  • Webdriver:TakeScreenshot now always captures the top-level browsing context and not the currently-selected browsing context, if no element to capture has been specified (bug 1398087, bug 1606794).
  • Using Webdriver:TakeScreenshot's full argument causes the complete page to be captured (bug 1571424).

Changes for add-on developers

API changes

Manifest changes

No changes.

See also

Older versions