Firefox Developer Experience

Firefox 150 adds offline network emulation, improves header handling and logging behavior, and fixes issues with downloads, viewport races, and shadow DOM handling.

WebDriver updates for Firefox 149: a new command to control downloads, realm events for workers, and various fixes for WebDriver BiDi and Marionette.

WebDriver updates for Firefox 147: New file dialog event, screen dimension emulation, CSP bypass for script commands.

WebDriver BiDi updates in Firefox 146 include improvements to our emulation and network features, as well as a new locator type. And still a few fixes for WebDriver Classic / marionette.

WebDriver updates in Firefox Firefox 145: new command to emulate other user agents, new event to monitor the end of downloads and several other fixes for our WebDriver BiDi implementation.

WebDriver updates in Firefox 144: new downloadWillBegin event, and commands to override screen orientation and timezone, and a few additional fixes.

Firefox 142 comes with a new command to set the locale override, a few changes around handling the cookies and setting the proxy, and more!

In Firefox 141: set a proxy for Firefox Containers, new browsingContext event to monitor history APIs and updates about Cookies for both BiDi and Classic.