I miss Firebug for a very specific, perhaps even idiosyncratic, reason. As someone with a huge amount of screen real-estate but nevertheless a strong desire fo

I miss Firebug for a very specific, perhaps even idiosyncratic, reason. As someone with a huge amount of screen real-estate but nevertheless a strong desire for applications to be tidy in their use of that space, there was a behavior of Firebug that is lacking in DevTools: the ability to use a single separate window across all Firefox tabs. With Firebug, the user could detach the Firebug window from the browser and position it separately on screen. Firebug could be enabled for any tab and the contents of the Firebug window would dynamically change to reflect the browser tab with focus. In DevTools (and also in Chrome), this mode is not an option. Instead, the user has two options, both of which are less desirable: 1. Open a separate DevTools window for each tab. This bloats the window stack in the same way browsers did generally before the advent of tabs, making it a poor option. 2. Leave the DevTools docked inside the browser window. This is poor because large screen real-estate cannot be properly utilized by positioning the DevTools separate from the browser window. Despite an abundance of screen real-estate, either a chunk of the browser frame needs to be consumed with the DevTools or the browser is made awkwardly wide/tall which adversely affects all tabs that do not have the DevTools open. Because window management and usable screen real-estate is so critical to my productivity, this very specific behavior of Firebug is what I miss more than anything. The only Bugzilla bug I have seen about the matter [1] is fairly unpopular, however. [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1219917 https://bugzilla.mozilla.org/show_bug.cgi?id=1219917