To view a page in print preview mode, open the DevTools main menu, select More Tools > Rendering, and then enable the Emulate CSS Media checkbox with the dropdown menu set to print. The naming of settings have changed once again: Thanks wcpan, Standard8, gbrown for fixing would-become-perma-fail tests. Some unexpected fixes attributed to enabling OOP extensions, AsyncShutdown and Bookmarks async API. Also, to just reduce the steps to get to PrintPreview in Firefox, try the PrintPreview extension, that will create a toolbar. The team has cleared out 20+ intermittents, perma-oranges, crashes, leaks, talos regressions in the last few weeks to clear the way for enabling by default on Nightly. There is a menu to disable and enable individual stylesheets and a 'Display by media type' menu as well. To view a page in print preview mode, open the DevTools main menu, select More Tools > Rendering Settings, and then enable the emulate media checkbox with the dropdown menu set to print. Firefox + Web Developer toolbar extension has a way to enable/disable various stylesheets. Google Developers Docs around Chrome DevTools and the "Emulate Media" option have been updated for Chrome >51: Below the drop-down menu, select both Cookies and Cache. In the Time Range to clear: drop-down, select Everything. Click History and select Clear Recent History. However, the Print Media Emulator has moved (again): If you find that Firefox can load some websites but not others, first clear your Firefox cookies and cache: Click the menu button to open the menu panel. Unfortunately, it seems the docs have not been updated in regards to print emulation. I am running a Spring MVC Web app running on Tomcat locally and am able to view the source fine when explicitly putting the path in the browsers address bar. Then, select Media in the emulation drawer. I am having trouble getting the new Firefox Developer Edition (Developer Tools) to show loaded source files in the debugger.
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