User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:37.0) Gecko/20100101 Firefox/37.0 Build ID: 2015040300 Steps to reproduce: Open a bunch of tabs in Firefox, enough to fill the entire tab bar and then some, so that the little "↓" sort of icon should appear. Actual results: The little "↓" sort of icon does appear, if you're lucky. But it doesn't have a list of all open tabs, which was sort of the purpose of it. All it does have is two rather useless options: 1. Group tabs (I clicked on that one out of desperation and now I have some idiotic, pointless window which simply won't close, but that's another story and I'm not doing a bug on it because I just don't care about that "feature"). 2. Undo close tab (which btw doesn't work either, as per bug #1163010) Expected results: I would have loved to see a list of all the tabs that I had open, and which btw have now disappeared irreversibly since I clicked on that **** "Group Tabs" thing. PS: Do you have any paid QA people at all? Do they have any test plans that use permanent private browsing? Or am I going to get the "but 97.38596% of our users..." twaddle? Ta.
Interesting; I assume the relevant code here is the popupshowing handler in http://mxr.mozilla.org/mozilla-central/source/browser/base/content/tabbrowser.xml#5807 (as part of the tabbrowser-alltabs-popup binding), but I don't see any smoking gun for this behaviour. It would be good to step through this in a debugger, or at least add some debug output showing how many tabs are reported by gBrowser.visibleTabs.
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