Firefox os x 20 tries to restore session at every start up

Im using firefox 20 beta and os x 10.8.2, Ive been on beta channel for a long time but with 20 beta every time I start firefox it says "well this is embrassing..." and tries to restore couple of tabs I visited before..problem just started after first update of beta ,
I tried;
reset firefox
complete uninstall by deleting profile folder
also deleting org.mozilla.firefox.plist file in preferences folder in library
made clean instal but nothing changed. Im sure firefox closes normally as I checked on activity monitor and my homepage is about:newtab. "show tabs from last time" is not selected from preferences.
same problem continues on aurora 21 too, it just started after first update of 20 beta, I used 20 beta without such problem for a week, but since first update of beta its broken even on aurora too.
btw java is disabled and problem occurs when flash is not working..

This bug has been Fixed in Firefox 21.
Either wait for that to be released, or upgrade to the Beta version Firefox 21
* http://www.mozilla.org/en-US/firefox/channel/#beta/beta-desktop
(I note; from the bug; that in some circumstances Windows may be affected by something similar if not closed from the menu, and that is not yet fixed {bug 853779})

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After installing the latest upgrade firefox just hangs when opening - was fine before. have tried deleting restore session but worse not better now

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== This happened ==
Every time Firefox opened
== yesterday, after installing the upgrade ==
== User Agent ==
Opera/9.80 (Windows NT 5.1; U; en-GB) Presto/2.5.24 Version/10.54

I'm using Mac OS 10.4.11 & even typing this message the characters appear so slowly that I could get a hammer and chisel and inscribe the words faster than the new Firefox runs. WTF?

Hi when i click on mozilla firefox it keeps coming up saying restore session why is this every time i go on firefox how can i stop this and delete it all together

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When you quit firefox with tabs and windows open it "remembers". When you start Firefox it tries to restore the tabs and windows you had open.
You may also want to check the preferences for Firefox:

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Hangs on Firefox startup
Firefox says We're embarrassed and just hangs needing to be force quit--

I've found the issue on Mac. Apparently if the server sends back nothing, "Content-Length: 0", NetLingo hangs... not very robust. This isn't a problem on Windows, but the hack is to always send at least one byte payload.

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The next step is to try recovery mode as described here:
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How do I stop Firefox from trying to restore session every time I turn on my computer?

How do I stop Firefox from doing this?

Make sure that Firefox closes properly and that there isn't a hanging Firefox or plugin-container process left in the task manager.
Use "Firefox/File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit") to close Firefox if you are currently doing that by clicking the close X on the title bar.
See also:
*"Hang at exit": http://kb.mozillazine.org/Firefox_hangs
*"Firefox hangs when you quit it": https://support.mozilla.org/kb/Firefox+hangs
There are other things that need your attention.
Please Update to the latest Firefox 17.0.x version.
*Help > About Firefox
*https://support.mozilla.org/kb/update-firefox-latest-version
The Firefox Firefox 12.0 version that you currently run is no longer supported with security updates. 
It is important to update Firefox and add-ons to the latest versions to get the latest bug fixes and security updates.

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Running Firefox 3.6.13 on Mac G5 OS 10. 4, dual 2.0GHz, ton of memory.
This started happening 6 months ago.
With 4 or mare other tabs open, watching video on youtube results in a crash 50% of the time. The "Opps This is embarrassing" window appears, but the checkmarks are not there next to the icons. Clicking the icons makes the icons reappear and disappear, but ultimately, Firefox attempts to load ALL the tabs/pages, so obviously "clicking" is not unchecking anything.
This means '''I never was able to uncheck''' the possible offending site(s), which makes troubleshooting nearly impossible because I essentially can't trouble shoot a problem site(s), using Firefoxe's method. I don't know it youtube, I simply suspect that.
'''When Firefox restarts it immediately crashes again, and over and over. '''
I have four crash report codes from today.
The only solution is to log out of my account, and log back in. That seems to work.
But I'm trying to fix the "restore window" that never shows the checkmarks anymore. Do I reinstall forefox? This has happened with the last 3 versions, and has never solved the problem. Seems like some kind of preference file corruption?, since firefox acts the same way no matter what version of 3.6 I run.
The last four error codes from the first crash to the most recent are:
Crash ID: bp-9d0ea936-8c65-42e6-a659-7e0c82110520
Crash ID: bp-1618de88-bdc9-4023-abd3-4e0632110520
Crash ID: bp-13e7319a-0327-4d52-a77a-0db032110520
Crash ID: bp-60e0489f-3762-4517-b175-703fc2110520
Any help appreciated. Thanks

No, you wont lose any bookmarks. 
You only lose tabs that you have marked as "Pin as App Tab" via the right-click context menu of that tab and other tabs from the current session. 
You can bookmark an Ap tab if you haven't done that yet.

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Doublechecking. Have you worked through the following user tip?
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You can check if you have a user.js file in the Firefox profile folder that sets the browser.sessionstore.resume_session_once pref to true.
*http://kb.mozillazine.org/browser.sessionstore.resume_session_once
*http://kb.mozillazine.org/Preferences_not_saved

Ipod froze when i tried to restore

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Firefox crashes on loading; it's trying to restore a previous session. Can't retrieve crash report.

When I try to open Firefox, I briefly see the program trying to open -- the address line says "restore session." Then it crashes. I get a screen saying "We're sorry" "Firefox had a problem and crashed. We'll try to restore your tabs and windows when it restarts."
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Every time Firefox opened
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== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; GTB6.5; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C)

''Seemed'' to be oerating normally is a good choice ow words. I too though the safe mode, plus not restoring session would solve my problem, but then opening certain tabs --I wan't really able to experiment much before a crash, but I thought may sign-in or automatic sign-in ones--it would crash again. I really like and miss Firefox, and wish I knew haow to revert back to the previous version before it automatically udated to Firefox 4...

When trying to open Firefox it trys to connect to restore the prevoius session (not responding) and will not start. I uninstalled then reinstalled and it is still stuck. I have to X the box and use the popup to close the noresponsive program

Firefox will not start. When I try to open it it gets stuck trying to restore the previous session. It shows "connecting" and the little round working cursor just spins. The program says (not responding) in the top. Please help me fix this, thanks

Delete the files sessionstore.js [2] and sessionstore.bak in the Firefox Profile Folder.
* Help > Troubleshooting Information > Profile Directory: Open Containing Folder
* http://kb.mozillazine.org/Profile_folder_-_Firefox
If you see files sessionstore-##.js with a number in the left part of the name like sessionstore-1.js then delete those as well. 
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See also:
* [1] http://kb.mozillazine.org/Session_Restore
* [2] http://kb.mozillazine.org/sessionstore.js

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I count on using the Firefox restore session feature. But it's stopped working. For the past couple of days, it hasn't worked a single time. (I haven't changed anything on my PC.) It just suddenly stopped working.
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Which file is mentioned as the cause of that script error? 
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We close all applications before we power down the system. There is nothing open before we turn it off yet the same boxes open when we turn it back on.

When the first version of the Restore Session tab was implemented in an update for Firefox?

''Duplicate post, continue here - [https://support.mozilla.com/en-US/questions/806369]''
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* http://kb.mozillazine.org/Session_Restore

Firefox os x 20 tries to restore session at every start up

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