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Re:Firebug lives on in Firefox DevTools by WorldMaker on Tuesday December 20, 2016 @01:44PM (#13222642)
View Source has been around since the beginning, so it's not entirely new.

What's new seems to be all the work on making the dev tools comprehensive and "IDE-like", and I think that has as much to do with it is as useful to the companies building the browsers as the users of the browser. Such that Chrome probably added them in directly to save Google developer time and needing a separate IDE/toolkit/extension install, and the rest of the browsers followed.

It's interesting too in that Edge now uses the Dev Tools as a way to tier the user experience, such as the traditional View Source, out of the base experience. If you open the Dev Tools Edge asks if you are a developer and lights up a bunch of functionality that "ordinary" users don't need to see, like View Source.

Re:Firebug lives on in Firefox DevTools by gsnedders on Tuesday December 20, 2016 @02:52PM (#13223338)
I believe WorldWideWeb.app didn't originally have View Source: it provided a WYSIWYG editor which was intended to be the main way to edit pages, AIUI.