User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6 My preferences: Restore from last session. Problem: Some website is opened. Then I open a blank tab and close the tab with the website. Only the about:blank page is opened. I close firefox. Restarting firefox, it says: Problems occured in restoring, want to restore the tabs "about:blank", and so on? Hope you gonna fix it. Reproducible: Sometimes Steps to Reproduce: 1.Run fox. 2.Open a website. 3.Open a blank tab. 4.Close websitetab. 5.Close firefox. 6.Restart firefox. 7.Sometimes the problem occurs - or not. Expected Results: Open about:blank as usual.

do you see this when starting firefox in safe mode? https://support.mozilla.com/en-US/kb/Safe+Mode

(In reply to comment #1) > do you see this when starting firefox in safe mode? > https://support.mozilla.com/en-US/kb/Safe+Mode I do not know. The "bug" does not appear every time. Today I saw it some times (took a screenshot). Firefox 3.6.8. I guess it happens when Windows 7 changes to "hibernate"-mode while Firefox is still running. After returning to Windows and then closing Firefox, the errormessage appears after the next start. But I was unable to reproduce the result every time (only 2 times out of 6?). It is nice to know, why the bug appears. But can't you change the "session restore"-behavior with blank pages? Show session restore dialog _except_ in case of blank pages?

It sounds like Firefox thinks it crashed the previous couple times. How are you quitting Firefox? Do you still see firefox.exe in the Task Manager after quitting?

(In reply to comment #3) > It sounds like Firefox thinks it crashed the previous couple times. For sure. OK, maybe this bug is not a bug with blank pages, but with closing firefox unproperly. Why? I do not know. Nevertheless, I think there should be the "special case" if there was a crash with a blank page. Open it (about:blank) again and thats it. Firefox need not to ask for restoring a blank page. It is irritating for users (ok, in fact it is irritating to me) if there is a message that says there was no information lost. > How are you quitting Firefox? Click on [x]. > Do you still see firefox.exe in the Task Manager after quitting? No. Back to topic: So, this is not a bug, but an irritating feature with room of improvement? :)

I tend to agree, somewhat, with what the reporter is saying here. If a session only contains a single blank page, I'd say we should just start a new session; regardless of how many times a session has crashed or not. Paul, what are your thoughts on this scenario?

(In reply to comment #5) > I tend to agree, somewhat, with what the reporter is saying here. If a session > only contains a single blank page, I'd say we should just start a new session; > regardless of how many times a session has crashed or not. > > Paul, what are your thoughts on this scenario? We've got bug 523073 for that (sort of). It gets to be a matter of defining what a session is. Is it just the open tabs? Or does it include all the closed tabs & windows? I'd like to keep this bug around though to figure out what the actual problem is here.

I can reproduce this using STR from mozillazine at http://forums.mozillazine.org/viewtopic.php?p=12771677#p12771677 Quoting mahi: Steps to reproduce: 1) Launch Firefox with a fresh profile 2) In "about:config" set: browser.newtab.url = about:blank (blank tab instead of tiles screen) browser.startup.page = 3 (enable session restore) 3) Click the "+" button (new tab button) or press CTRL+T 4) Close "about:config" and "Mozilla Firefox Start Page" tabs [so only about:blank with no history remains] 5) From the menu perform "Firefox/File" > "Exit" to close Firefox Following steps can be repeated infinitely - it always works correctly: 6) Launch Firefox 7) From the menu perform "Firefox/File" > "Exit" to close Firefox However following approach always fails on the third launch: 6) Launch Firefox 7) Press ALT+F4 to exit Firefox On the third launch you are greeted by the "Session Restore" tab: "Well, this is embarrassing. Firefox is having trouble recovering your windows and tabs". If "browser.tabs.closeWindowWithLastTab" is "true" you can also reproduce the issue with shurtcut CTRL+W (close tab) instead of ALT+F4. It also goes wrong when using the top right close button. To reset the situation (in order to repeat the instructions above): Click the "+" button (new tab button) or press CTRL+T Close "Restore Session" tab From the menu perform "Firefox/File" > "Exit" to close Firefox There appears to be a difference in the Firefox closing mechanism between using the menu and the other methods (shortcut keys, window close button,...).

Simplified STR: 1) Start in clean profile 2) Open about:blank in a *new* tab (it probably matters that there is no history) 3) close the other tabs 4) Exit Firefox from the menu or Firefox button 5) Launch Firefox 6) Alt-F4 to exit 7) Open Firefox 8) Alt-F4 to exit 9) Open sessionstore.js in the profile folder Expected result: "recentCrashes":0 Actual result: "recentCrashes":1

I can reproduce this issue on Windows with Firefox 21, 22.0b and 23.0a however in order to trigger this on windows you need to close Firefox (one window with one about:blank tab) with File > Close Window or with the window close button (top right), closing Firefox with File > Exit work ok

Regression window(m-c) Good: http://hg.mozilla.org/mozilla-central/rev/e8f8a3f6f1f6 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20130218 Firefox/21.0 ID:20130218212328 Bad: http://hg.mozilla.org/mozilla-central/rev/3f0f2fc4bd0f Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20130219 Firefox/21.0 ID:20130219014027 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=e8f8a3f6f1f6&tochange=3f0f2fc4bd0f Regressed by Bug 829568