F i install firefox 4, my old firefox data as in cookies and add-ons will get lost or what??

if i install firefox 4, my old firefox data as in cookies and add-ons will get lost or what??
I need it and also want to install the new Firefox
== This happened ==
Not sure how often

You should always use beta test versions with a new and separate profile and keep the regular release so you can use that version in case of problems.
See http://kb.mozillazine.org/Profile_Manager
Firefox 4.0b1 is the first of the beta test release versions and still has a lot of bugs.
Such releases are meant for testing only so if bugs are found then they can get reported and fixed before the final 4.0 version gets released.
If you do not have experience with such test releases then you are better of with the latest Firefox 3.6.6 release.

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Thank you very much. I reset Firefox and it worked. I knew of MalwareBytes but had no intention of installing it before. I decided to install it anyway now and it even found 3 trojans that my Avira couldn't.
My first instinct was to reset Firefox to it's default state but I was afraid of losing my bookmarks, cookies, site preferences etc. so I didn't even bother. Now that I saw it was my last hope, I saw there is actually a phase between clicking the "Reset Firefox" button and the action being executed. The phase explains what the button will do and asks if you agree. I did not know that and I am really happy I could keep my old stuff.
Thanks a bunch, even if my instincts were right, I wouldn't have bothered to reset Firefox just because I'd be too lazy to get every setting back to how it was.
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All of my extensions, and add-ons were deleted overnight. I can't find an old firefox data folder to restore my old profile

Firefox deleted all of my extensions and add-ons overnight. None of the fixes I've found work, I need help restoring my old profile

''cor-el [[#answer-716602|said]]''
<blockquote>
Did you only lose the extension or did you lose other personal data and settings as well?
You would normally only lose the extensions if you create a new profile folder, either via a reset/refresh or possibly because of problems with the profiles.ini file.
With a reset you would have an "Old Firefox Data" folder on the desktop.
</blockquote>
I only lost the extensions. I left the PC on to do a steam download overnight. When I woke up and opened up the browser it was in base mode. All of my tabs, saved data were present. I looked for the Old Firefox Data folder then, but it isn't there.

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I've currently got automatic updates turned off, and that is where they will stay unless I can verify that the add-ons are backwards compatible or there is an update for the add-on.
Is there a way to see what current add-ons will be disabled with an update?

Yes, during the update there is a list of add ons that come up that will not be added when you update. You can cancel the update if it lists one that you do not want to no longer use.
The block list is also here: [https://addons.mozilla.org/en-US/firefox/blocked/]

When I downloaded the new Firefox about a week or two ago all my bookmarks, and add-ons disappeared and I want you to give them back to me asap?

When I downloaded the new Firefox about a week or two ago all my bookmarks, and add-ons disappeared and I want you to give them back to me asap?

You shouldn't wait that long to ask advice. Firefox only keeps a (rotating) backup of bookmarks for the last 5 days that you started Firefox. So you may be out of luck.
You can check that you still use your old default profile that had your bookmarks. 
* http://kb.mozillazine.org/Recovering_a_missing_profile
* http://kb.mozillazine.org/Lost_bookmarks
* http://kb.mozillazine.org/Locked_or_damaged_places.sqlite
For the extension, see "Corrupt extension files": http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
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Hello Ted.
Although possibly not related to your problem, I will remind you that the version of Firefox you are using at the moment has been discontinued and is no longer supported. Furthermore, it has known bugs and security problems. I urge you to update to the latest version of Firefox, for maximum stability, performance, security and usability. You can get it for free, as always, at [http://www.getfirefox.com getfirefox.com].
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Whenever you have a problem with Firefox, whatever it is, you should make sure it's not coming from one of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in [http://support.mozilla.com/en-US/kb/Safe+Mode safe mode] and select ''Disable all add-ons''. If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See [http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes this article] for information about troubleshooting extensions and theme. You can troubleshoot plugins the same way.
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Thanks but I don't think this will help. Like I said, all of my add-ons were working fine and compatible until after running a previous version of FF. I am sure they are still compatible, but they are not working at all.
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When I try to download firefox it asks me if I want 6.1 and that it will harm my computer. I just want firefox 5

When I try to download firefox it asks me if I want 6.1 and that it will harm my computer. I just want firefox 5 edit

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Firefox offered me a program that killed unwanted cookies and showed me a pop-up as they were deleted and it's gone. How can I get it back? Thanks

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Thanks, but that didn't do it.
When it was working, there was a small Firefox icon in the lower right corner...it showed a pop-up when someone tried to load a cookie, described it and deleted it. Yahoo was trying to load cookies every 15 minutes or so, this feature alerted me and described the action as 'self-destructed'. Would like to get it back....
Thanks, Tedzo

I have firefox set to delete personal information (log in to websites) when I close it ... However firefox isntead doesn't delete anything, keeps the cookies, and when I reopen firefox I'm still logged in (to websites like facebook). What do?

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* https://support.mozilla.com/kb/Clear+Recent+History
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cor-el,
This turned out to be the root cause for my problem. Simply renamed the
places.sqlite.corrupt file to places.sqlite and my profile (including bookmarks) worked again. Thanks!
By the way, I first noticed that something was wrong with my _profile_ when, in addition to lost bookmarks, I noticed that I couldn't create _new_ bookmarks. Also was not able to restore bookmarks from a backup .json file. So I created a new profile, and was able to restore the bookmarks from the original profile's backup. That led me to exploring your suggestion. Thanks again!

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'''''Other Issues''''': to correct security/stability issues
'''Update Java''': your ver. 1.5.0_06; current ver. 1.6.0.20 (important security update 04-15-2010)
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F i install firefox 4, my old firefox data as in cookies and add-ons will get lost or what??

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