>>> My Info: Win7_64, Nightly 49, 32bit, ID 20160526082509 STR_1: 1. Open new tab 2. Open new tab 3. Press Ctrl+Shift+Tab to switch to the tab from Step 1 AR: Dropmarker in urlbar blinks ER: Dropmarker shouldn't blink, BECAUSE IT'S ALWAYS PLACED IN URLBAR (just like in non-e10s mode, just like before regression bug 1203494) This is a regression. Good old Firefox 28 is unaffected, Nightly 49 (2016-05-26) is affected.

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:53.0) Gecko/20100101 Firefox/53.0 I have tested this issue on Windows 10 x64 with the latest Firefox release (50.1.0) and the latest Nightly (53.0a1-20170104030214) and managed to reproduce it following the steps in STR_1. Narrowed nightly regression window from [2015-12-30, 2016-01-01] (2 days) to [2015-12-30, 2015-12-31] (1 days) (~0 steps left) Got as far as we can go bisecting nightlies... Last good revision: c690c50b2b543b420803e8192d6e08e06b20e0a3 (2015-12-30) First bad revision: 22f51211915bf7daff076180847a7140d35aa353 (2015-12-31) Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=c690c50b2b543b420803e8192d6e08e06b20e0a3&tochange=22f51211915bf7daff076180847a7140d35aa353 Considering the bugs from the pushlog above, this might be caused by one of the following bugs: Bug 1234936, Bug 1234936, bug 1233747 or bug 1235709. Gijs, can you please take a look at this?

(In reply to Emil Pasca [:emilpasca] from comment #1) > User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:53.0) > Gecko/20100101 Firefox/53.0 > > I have tested this issue on Windows 10 x64 with the latest Firefox release > (50.1.0) and the latest Nightly (53.0a1-20170104030214) and managed to > reproduce it following the steps in STR_1. > > Narrowed nightly regression window from [2015-12-30, 2016-01-01] (2 days) to > [2015-12-30, 2015-12-31] (1 days) (~0 steps left) > Got as far as we can go bisecting nightlies... > Last good revision: c690c50b2b543b420803e8192d6e08e06b20e0a3 (2015-12-30) > First bad revision: 22f51211915bf7daff076180847a7140d35aa353 (2015-12-31) > Pushlog: > https://hg.mozilla.org/mozilla-central/ > pushloghtml?fromchange=c690c50b2b543b420803e8192d6e08e06b20e0a3&tochange=22f5 > 1211915bf7daff076180847a7140d35aa353 > > Considering the bugs from the pushlog above, this might be caused by one of > the following bugs: Bug 1234936, Bug 1234936, bug 1233747 or bug 1235709. > > Gijs, can you please take a look at this? This has nothing to do with beforeunload or dialogs, as far as I can tell. Why do you suspect those bugs rather than any of the other ones in that pushlog? How sure are you that the pushlog is correct?

In fact, this is basically just about whether the location bar remains focused during a tabswitch, so I'm duping this to bug 1262670 which is about the general problem of focus moving slowly during/after a tabswitch. It's not meaningful to track this as a regression if it's basically a result of e10s (which is implied in comment #0).