Why is Firefox intermittently deleting my settings & customizations?

During the last couple of weeks I have had a problem with firefox intermittently deleting my Settings & Toolbar Customizations. Theres no way of knowing when it will occur. I sometimes just close firefox and when I open it again later im greeted by the 'Welcome to Firefox' page. At this point my toolbar customizations have all reverted to the default, my homepage is gone and all my settings have been reset to default too. I then set everything back up again and then the same thing will happen later on. It's occurred about 10 times now. I've tried disabling my addons & Reinstalling firefox and re-entering my settings & customizations from scratch and it still happens. Sometimes it won't happen for 3 or 4 days. Other times it will happen 3 or 4 times in a single day. It's getting very frustrating now and I'd just like to find out the cause. Is anyone else having this problem?
Heres a few extra details :
OS - Windows 7 Home Premium 32-Bit
Firefox Addon's - Backward/Forward History Dropdown 0.23
Status-4-Evar 2011.11.13.22
As I say I disabled both those addons and it still occurred so I don't believe they are the problem. Any Ideas?

'''PopClip may be the culprit'''
I looked everywhere on my MacBook trying to find out why FireFox was launching at login, to no avail. Finally, thinking that it might be an infection of some sort, I uninstalled Firefox 9. Well today, while updating PopClip (a WONDERFUL and useful little utility), I noticed that one of the bugfixes involves issues with launching Firefox (see attached screenshot).
For more info on this, see the info on v1.2.3 at http://pilotmoon.com/popclip/. I installed this update, reinstalled Firefox, and the problem is no longer there. Yay!

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Hey,
Sorry about this issue with GUI changes, I hadn't heard of it before :/ The people who answer questions here, for the most part, are other Firefox users volunteering their time (like me), not Mozilla employees or Firefox developers.
If you want to leave feedback for Firefox developers, you can go to the Firefox ''Help'' menu and select ''Submit Feedback...'' or use [https://input.mozilla.org/feedback this link]. Your feedback gets collected at http://input.mozilla.org/, where a team of people read it and gather data about the most common issues. Hopefully they'll be able to do something about this.
Thanks!
Curtis Parfitt-Ford
Mozilla Support

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''cor-el [[#answer-664256|said]]''
<blockquote>
Don't get confused:
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</blockquote>
OK so I agree I was confused. What is confusing me even more is the number of times sites tell me I need to set my cookie settings to accept when as far as I can see it already is.

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Why is Firefox intermittently deleting my settings & customizations?

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