>>> My Info: Win7_64, Nightly 49, 32bit, ID 20160526082509 I recommend you to add line "127.0.0.1 reindernijhoff.net" in file "c:\Windows\System32\drivers\etc\hosts" before you perform STR_1. That is not necessary. >>> STR_1: 1. Create new Firefox profile, launch it. Close Firefox. Delete "sessionstore.js" in that profile 2. Save attached "sessionstore 1", copy it to the profile from Step 1, rename it to "sessionstore.js" 3. Create file "user.js" with text `user_pref("browser.startup.page", 3);` in the profile from Step 1 4. Launch profile from Step 1 5. Open new tab, type/paste "example.com/#Unique20160702123456" in urlbar. Press Enter. Close the tab. 6.A) Press Ctrl+Shift+T 6.B) Open Australis Menu, click history button to view recently closed tabs AR: Browser restores tab with an article on site "reindernijhoff.net", because tab from Step 5 is added in history before 2 other tabs ER: Browser should put closed tab from Step 5 in the very end of history of closed tabs This is regression from bug 1109875. Regression range: > https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=4c93d46ab92f&tochange=60349cbc3d4e Notes: 0) Work on e10s breaks normal things even in non-e10s mode. See also bug 1243011. 1) This bug happens regularly, but I can't reproduce it (create sessionstore file intentionally) 2) I use many browser versions, including old, so probably it's the cause. Probably not. I don't know 3) It may turn out that it's possible to get that sessionstore file only on Firefox < 40 In this case this bug should probably end up as Invalid/Wontfix. Though in bug 1246555, they decided to implement some protection from bug, just as I requested. 4) Somebody who knows how sessionstore work should look at attached file and tell me if there's anything strange in that file. That can possibly help to get STR for creating such a file.

Resolving as a dup, per changes from several months ago.