So as to make room for the new tab, slide space over to make room for the tab.
Additional feedback - https://www.reddit.com/r/firefox/comments/73lgc2/now_that_photon_is_here_in_full_force_and_57_is/ -- user preference seems to be: > Sublime Text 3: I thought I'd also include Sublime Text 3's behavior because I do notice that it appears to be a nice compromise between the two, just as good as Chrome's in my opinion. Tabs snap in and out of tab bars very seamlessly, but new windows aren't created until you let go. This actually feels even snappier in a way because there is no lag introduced from the creation of the window. > > https://streamable.com/mb3o3
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