Firefox freezes every time I start it up

This started after I upgraded to 4.0 Every time I go to open Firefox, it opens fine, but freezes right after. The home page does not load, but its tab reads "google" and the little swirlie next to it is frozen too. I don't recall any system changes prior to the update. I figured eh whatever maybe it's 4.0 on my machine, but I just downloaded and installed 3.6, and the same problem occurs. I've been forced to use Opera for the last few weeks, because I refuse to use IE.

A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

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Firefox crashes every time it starts up

Firefox crashes every time I try to open it. I have tried resetting and it also crashes in safe mode. The last crash report is:
Crash ID: bp-4a5920f6-779f-431f-9c4b-6edb12100324
My OS is XP Professional and I am running v25 of Firefox.

That crash report doesn't seem to have been send.
See if you can submit this report by clicking on it on the about:crashes page if there aren't any other (more recent) reports with a "bp-" prefix that have been send.
*bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
You can find the IDs of the submitted crash reports on the about:crashes page.
See:
*http://kb.mozillazine.org/Mozilla_Crash_Reporter
*https://support.mozilla.org/kb/Mozilla+Crash+Reporter

Why does Firefox freeze every time I try to install Adobe Flash player? I have uninstalled it and reinstalled it with and without the plugin container.

When I have Adobe Flash player installed and I open Firefox it will freeze up as soon as I open an additional tab other than my home page tab. In order to close Firefox after it freezes I have to use my Windows Task Manager to end process. As soon as I uninstall Adobe Flash player and reboot and then open Firefox it works fine.

Does it help if you disable the plugin-container process?
See http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins

I have to sign in into firefox sync every time i start firefox

I'm using Firefox 34.0.5 and everytime i start it sync isn't working. It either says session expired, you need to sign in to continue or asks me to re-sign in with a password in order to work. None the less when i manage to sign in sync doesn't save my bookmarks and other stuff.

I have to troubleshooting questions:
Do you have cookies enabled for accounts.firefox.com?
*[https://support.mozilla.org/en-US/kb/enable-and-disable-cookies-website-preferences]
Do you have dom storage enabled as well? [[Firefox Sync troubleshooting and tips]] (go to the end of the article)
Does this happen on all or one device, and does this happen with all of your other sites that require logins?
If changing the cookie settings does not help, try it in Firefox Safe Mode to make sure its not an add on: [[Troubleshoot Firefox issues using Safe Mode]]
Then we can take a look at the logs to see if there are any errors: * How do I turn on sync logs:
# Open about:config and turn on: services.sync.log.appender.file.logOnSuccess and services.sync.log.logger.engine.bookmarks
# Restart Firefox and look at: about:sync-log
# Logs and error messages will be located here
Please also use pastebin.mozilla.org for sharing any errors that relate to this issue.
Thank you.

Since upgrading to Firefox 4 every time I open or refresh a page everything freezes and I have to wait a minute or so for it to respond again. I'm also having problems with uploading to Photobucket and watching things via Youtube since the upgrade.

Since upgrading to Firefox 4.0 a couple of days ago, every time I open or reload a page the whole browser freezes. At first I thought it might be down to compatibilty issues with other programmes open at the time, but as the problem has persisted when those programmes aren't open I'm starting to think it's the browser itself and it's getting extremely frustrating having everything freeze every time I want to change a page.
My other problem is twofold: with Youtube nothing plays at all because the toolbar with the play/pause option simply isn't there and I am unable to access the upload function on Photobucket because likewise it won't appear. I'm assuming this has something to do with Flash but have no idea how to fix it.
I've tried

hello, often such issues are caused by a firewall/security software which doesn't recognize & therefore blocks new firefox versions. please remove all program rules for firefox from your firewall and let it detect the new version of the browser again.
[[Fix problems connecting to websites after updating Firefox]]

I have instaled Windows 7 64bit Enterprise edition and installed the lastest version of Firefox and it freezes every time i launch it. Please help me.

I have instaled Windows 7 64bit Enterprise edition and installed the lastest version of Firefox and it freezes every time i launch it. Please help me.
4d4aae27-34ee-4620-b349-c03002813b2003-Jan-1312:30 AM
54e24e0e-dfc4-466b-a347-4bd95536773e03-Jan-1312:30 AM
22d351d2-6461-4f33-9fbd-6d31f769e73103-Jan-1312:30 AM
8a8da99b-335e-43bb-aa12-4634aa0b431003-Jan-1312:30 AM
a15bb095-aeb9-44e1-a79c-1a17cee207d503-Jan-1312:28 AM

None if these crash reports seem to have been send.
Do you have crash reports with a "bp-" prefix that were submitted and that show a crashing thread?
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do not click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
You can use one of these to start Firefox in Safe mode:
*On Windows, hold down the Shift key while starting Firefox with a double-click on the Firefox desktop shortcut
*On Mac, hold down the Options key while starting Firefox
See also:
*http://kb.mozillazine.org/Firefox_crashes
*https://support.mozilla.org/kb/Firefox+crashes

Every time I start up my computer and load firefox, the theme I was using is not showing up.

Every time I start up my computer and load Firefox, the theme I was using has gone back to the default one. The theme is still on my computer and it works if I change it back, I just don't know why it won't show up when I first load Firefox.
== This happened ==
Every time Firefox opened

See http://kb.mozillazine.org/Preferences_not_saved and [[Preferences are not saved]]

Firefox Sync alerts "Incorrect password or username" every time it starts.

Every time I start Firefox, I get the following error message from Sync:
"Sync encountered an error while connecting:Incorrect account name or password. Please try again. [Preferences]"
In my about:log-sync, these lines appear:
<pre>Sync.Service DEBUG Exception: Login failed: error.login.reason.account No traceback available
Sync.Service DEBUG Not syncing: login returned false.</pre>

Turns out that my Sync password was not correctly saved in Firefox.
When I looked at my password saved in my Firefox profile (Options -> Security -> Saved passwords -> Show passwords) , some characters were different than the one I entered when I set up my account. For instance, there was an "©" instead of a "(".
I solved by it changing my password and using only "a-z" "A-Z" "0-9" characters.
(I filed a bug https://bugzilla.mozilla.org/show_bug.cgi?id=866586)

How do I stop one extra tab from opening every time I start Firefox?

Every time I open Firefox, my Yahoo homepage opens, but an additional page also opens which has a variety of website thumbnails and nothing else on that page.
In my Options, I have ONLY www.yahoo.com selected as my homepage, so only ONE page should be opening every time I start Firefox.
However, no matter what I do, this second page continues to open every time. It's very irritating, as half the time I've already begun to enter data into my homepage, then the second page pops up and switches to that and I'm typing on that page.
Please advise.

@jscher2000
Thank you!! That fixed the problem. The only add-ons I have are for my anti-virus software WebRoot, but somehow I must have installed Speed Dial without realizing it.
That fixed the problem. Greatly appreciated!!

Windows asks "Do you want the following program to make changes to this computer?" every time I start Firefox.

Neither my shortcuts nor my firefox.exe have Run As Administrator checked. And yet I get this prompt every time I start Firefox on my new laptop with Windows 7 Professional 64-bit.

unchecking "Run this program as an administrator" under the Compatibility tab in the properties of the program was my first guess....darn.
Ok I understand that this is only happening in Firefox. If you start it in safe mode does this still happen? This will tell you if its an add on or a changed configuration:[[Troubleshoot Firefox issues using Safe Mode]]

An extension automatically installs every time i start firefox

An extension from local system automatically installs every time I start Firefox after PC restart. I tried to disable it, remove it, but again after restart, it appears there. My question is how to disable addition of extensions and plugins from local system and how to block an extension. Extension name is Apps Hat 0.93.32 by nero

Thanks @the-edmeister , but your answer not satisfies my question. I also asked about disabling addon installation from local system and block an extension forever in firefox

I have to re-install adobe flash for firefox every time i start my computer even if firefox shows that my adobe flash is working it does not.I also get notices from the websites i visit (get flash e.t.c.)

i have the latest firefox 10.02 in win7 and even if firefox shows is installed my adobe flash is not working so i have to run the flash installer every time i start my pc.After this everything works fine until the next start when i have to run the flashinstaller again

There are two versions of the Flash Player plugin. One is ActiveX and only works in IE. It sounds like you have that one installed. The other one works in all other browsers.
What seems to be happening is that you have security software that's blocking one of those versions of Flash/restoring your computer state and so it gets uninstalled when you start your computer. The other possibility is that there are permission issues. Unfortunately, this isn't something that Firefox can control; it's a problem with the Flash installation (Firefox is dumb and just looks in the registry for a list of installed plugins to load).
Make sure that you're an admin on your computer when you try to install Flash and that you check your security settings. If that doesn't work, try posting to the [http://forums.adobe.com/community/flashplayer Adobe community forums] to see if other people have had similar issues and know how to address them.

Every time I start or close Firefox , Avira reports a malwaare problem.

Every time I start or close Firefox , Avira reports a malware problem. "A Virus or unwanted program 'HTML/Frame.tzt.3' was found in file 'C:\Documents and settings \Diane.DESKTOP\...\0CAEBd04'. "
I believe this began when I upgraded to Firefox 8.I have tried reinstalling Firefox 8, going back to Firefox 3.6, opening in safemode. Avira removes the file but warns again with each opening and closing. The warning does not appear with any other program or with IE. I am running XP.

Do a malware check with a few malware scan programs. You need to use all programs because each detects different malware. Make sure that you update each program to get the latest version of the database.
http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
http://www.superantispyware.com/ - SuperAntispyware
http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

How do I fix: The Plugin Check comes up EVERY time I start Firefox, AND I've installed Adobe Acrobat over 3 times but it still shows up as outdated

I crammed the info into the subject line, but to repeat...
Every time I start Firefox, the Plugin Check runs. Every ... single ... time. Very annoying. How do I get this to stop?
AND
I installed Adobe Acrobat at least 3 times, but it still shows up as "outdated". Obviously, it only truly installed once, but I tried clicking the button in vain hope that that will fix it.
But really, I simply don't want the Plugin Check to start every time.
thx

Alas, I already tried setting it to False (read it online somewhere) and it doesn't work. Perhaps if you could give guidance on why the Adobe install isn't completing, that would solve the plug-in check issue... Fingers crossed.

The welcome screen is loading every time I start up Firefox (version 5)

I recently upgraded to version 5.
Every time I start Firefox up, the "welcome to Firefox" screen is loaded in a second tab. I don't want it to load every time. The first time I launched the program was enough.

Do you see a Last 7 days folder?
If not then older history has been deleted. 
Firefox 5 doesn't use a time limit to store history like previous Firefox 3 versions did.

Firefox freezes every time I start it up

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