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We lose a few hundred ms of perceived user performance by waiting for a click event when selecting a toolbox tab. As a reference, browser tabs are switching on mousedown (in Firefox, in Chrome they are switching on click). Chrome devtools tabs are also switching on mousedown. The code driving this is at http://searchfox.org/mozilla-central/rev/51eae084534f522a502e4b808484cde8591cb502/devtools/client/framework/components/toolbox-tab.js#56
Comment on attachment 8907151 [details] Bug 1399180 - select devtools tab on mousedown rather than on click; https://reviewboard.mozilla.org/r/178838/#review183996
Attachment #8907151 - Flags: review?(gl) → review+
Pushed by email@example.com: https://hg.mozilla.org/integration/autoland/rev/2a131a0c2d11 select devtools tab on mousedown rather than on click;r=gl
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