Recently updated addons open their own page when I start Firefox

Every time I update an addon to a new version I get a page telling me I've successfully updated that particular addon whenever I start Firefox. It's is very irritating.
The pages don't appear in the Tools/Options/General/Home page box but they open every time I start the browser.
I already have a page for Colorful Tabs and another for Webmail Notifier and I can't disable them unless I disable the addons. However, I don't think this is an addon problem, but a Firefox one.

Some addons load their own page immediately after an update of that extension - once - to explain what the update is all about, such as new or improved features. If that page is being displayed more than once, something is wrong in Firefox prefs.
If you don't want those pages displayed ever, you'll have to check with support for each extension that does that, to see how that "first run" page can be turned off for each each extension. I am not aware of a "standard" pref that covers every extension that does it, and I don't either of the two extensions installed that you mentioned to be able to look for a pref like that.

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I copied this from your 5.0 download information: "All of the App Tabs you have set when you close Firefox will open as App Tabs when you start Firefox again." When I opened my computer today all my apptabs from yesterday had disappeared. Why?

Your download page for 5.0 stated: All of the App Tabs you have set when you close Firefox will open as App Tabs when you start Firefox again.
I liked the convenience of using App Tabs and was disappointed to find that the ones I had set up yesterday were gone today. Am I doing something wrong?

Works fine for me, I can simulate your problem by improperly closing Firefox.
The correct way would be to close the windows you don't want and then to exit Firefox through the File ("'''Alt+F'''") menu then use '''Exit''' or '''Qui'''t depending on your system.
But '''I can simulate your problem''' by closing the good window with "X" in the upper right-corner first (the one with the app-tabs) and then close the other window by any means.
You restart Firefox and open a window, since you closed without app-tabs there are none so you just see a window with your home page.
Firefox has some things added to Firefox 4 and therefore in Firefox 5.
# "'''Alt+S'''" (Hi'''s'''tory menu)
# "'''Restore Previous Session'''" (that's the window without the app-tabs, but you have to this first)
# "'''Restore Recently Closed Windows'''" -- can choose which window to reopen based on name and the mouse-over tells how many tabs. or you just use "'''Restore All Windows'''" without the guessing.
''I know you are on a Mac, and this affects Windows user more than anybody else, but it does affect other systems besides Windows, occasionally, perhaps more often now with the plugins container.''
The following may not completely eliminate having to terminate Firefox through the Windows Control Panel but it will come very close.
'''Plug-in and tasks started by Firefox may continue after attempting
to close Firefox''' The "X" in the upper right-hand corner closes the
Window (same as Ctrl+Shift+W) but even if it is the last Firefox window,
it does not necessarily close Firefox .
The only '''proper way to exit Firefox''' is to use '''Exit''' through the
File menu, not the "X" in the upper right corner of last Firefox window.
In the Firefox 4 and 5 that would be Alt+F then X
* '''Firefox hangs''' | Troubleshooting | Firefox Support http://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit
Use the '''Windows Task Manger''' to remove all running firefox.exe in the "'''Processes'''" tab of the Windows Task Manager, then restart Firefox.
If Firefox will still not start, remove the parent.lock file from the profile which is created each time Firefox is started to prevent other Firefox tasks from running, see 
http://kb.mozillazine.org/Profile_in_use#Remove_the_profile_lock_file
'''Avoiding Problems with close/restart''' ''choose either extension''
:Use to close and restart Firefox after enabling or disabling an extension, switching to a new theme, or modifying configuration files, then you don't have to worry about delay or have to look in the Task Manager to see if Firefox is closed yet.
Both extensions use the same keyboard shortcut "'''Ctrl+Alt+R'''" or a file menu option.
*"'''Restartless Restart'''" extension for Firefox 4.0+ only (2 KB download ) https://addons.mozilla.org/firefox/addon/249342/
*For older versions use "'''QuickRestart'''" extension (34 KB download) ( https://addons.mozilla.org/firefox/addon/3559/

Just updated to v5.0 and now when I start Firefox I get a pop-up that says checking compatability of add ons and the the Welcome to Firefox page and my home page appears. Can't get rid of the pop up or welcome page.

Above question covers it. I've tried reinstalling Firefox, clearing cache, history, etc. but still happens. I've created app tabs and when I restart Firefox, they are gone. Running Windows XP.

It is probably because you are not properly closing Firefox. Restarting your system would make sure that Firefox had terminated, but you do not have to do that.
To properly close Firefox on Windows systems, use
:File > Exit or "Firefox:" button > Exit
When you get the message "Firefox is already running" it is too late, and you must force termination of Firefox through the Windows Task Manager before restarting Firefox. Windows 7 has a keyboard shortcut to save you a step "Ctrl+Shift+Esc" then on "Processes" tab, select "firefox.exe" and use the "End Process" button. More thorough would be to right-click on the "firefox.exec" and choose "End Process Tree".
You would find firefox.exe in a Mozilla folder in your program files, but y0u would not want to delete it there, you would need to use the Control Panel which you have already identified and do it from there -- but generally you would not need to do that, and there is nothing in what you have posted to indicate that you should. But if you did do that, then don't let the install start Firefox for you as you would want to use you existing desktop icon or method of starting Firefox, and should decline having Firefox install start Firefox for you. When the install starts then invoke Firefox in your normal manner. This should eliminate problems of creating a new profile rather than using your old profile.

Add-on updates produce webpages that keep appearing when I start Firefox--how do I keep this from happening?

When the add-ons are updated, a webpage appears stating that the update was successful. In the past I would exit the tab and this notice would not appear again. However, these pages appear to be persisting when I close Firefox down and then reopen immediately and later. I have tried deleting all history and cookies, and resetting the home page multiple times, but none of these have done the trick. The version of Firefox I'm using is the latest version (7.0.1). I use Win 7 (64-bit).
History: this all started when my AddonFox add-on updated in September and notice web page saying it updated appeared. This has kept reappearing each time I enter Firefox. In addition since then, an update for the ReadItLater (v. 2.1.3), ColorfulTabs, and IE Tabs add-on updates have caused the same issue. As a result, whenever I enter Firefox, my homepage opens, as well as the notification pages that these four add-ons have updated.

See:
* http://kb.mozillazine.org/Preferences_not_saved
This can also be a problem with the file [http://kb.mozillazine.org/sessionstore.js sessionstore.js] and sessionstore.bak in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Profile Folder]
Delete [http://kb.mozillazine.org/sessionstore.js sessionstore.js] and sessionstore.bak in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Profile Folder]
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.
See:
* http://kb.mozillazine.org/Session_Restore

All of the App Tabs you have set when you close Firefox will open as App Tabs when you start Firefox again. This is not working, windows XP system. Bug or fix?

Just installed v5 of Firefox over v4.1 to XP system, 2Gb memory. Reinstalled 2Java updates, Silverlight and adobe reader as recommended in post firefox installation window. Rebooted and tried to make the new AppTabs work to no avail.
I"m not sure what else you need. The new AppTabs are not working. When Firefox is closed, AppTabs do not reappear when it is reopened later. They were installed by right-click on open tab as instructed on your upgrade website. Tabs were for yMail, gMail, and iGoogle. I have not tried to pin any other apps or sites. Is there anything I can do to make this work, or is this a bug? Thanks for the assist. mikeS

It is possible that there is a problem with the files [http://kb.mozillazine.org/sessionstore.js sessionstore.js] and sessionstore.bak in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Profile Folder]
Delete the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.
* Help > Troubleshooting Information > Profile Directory: Open Containing Folder
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/sessionstore.js
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. 
Deleting sessionstore.js will cause App Tabs and Tab Groups to get lost, so you will have to create them again (make a note).
See also:
* http://kb.mozillazine.org/Session_Restore

App Tabs do not load on restart. "All of the App Tabs you have set when you close Firefox will open as App Tabs when you start Firefox again."

Use FF3 and taking a look at FF4. I set up some App Tabs. Close FF4. Open FF4. No App Tabs.
Any Help?

Are you clearing your recent history when you close Firefox?
Firefox stores App Tabs and tab group details in the same file that stores details of browsing sessions. Make sure that you have not set Firefox to delete browsing history. For details of the setting to check see https://support.mozilla.com/kb/Clear+Recent+History

Why does Firefox Support Home Page open automatically as my second tab, to right of home page, when I start Firefox, and how do I stop this?

I have newly installed Firefox 4 on my computer as part of re-installing my OS. Firefox now opens with 2 tabs: my specified home tab and, to its right, a Firefox Support Home Page tab. I suppose I did something to cause this, but how can I undo it?

Reset your homepage and make sure that only one tab is open when you set your homepage.
http://support.mozilla.com/en-US/kb/How+to+set+the+home+page

All of the App Tabs I have set when I quite Firefox did not open as App Tabs when you start Firefox again, why?

All the App Tabs disappeared when I opened Firefox after quitting. I understand that the App Tabs that I had set remains there if I close the browser and not quit. So does that mean that I have to create App Tabs every time I restart FireFox?

App tabs and Tab Groups (Panorama) are stored as part of the session data in the file [http://kb.mozillazine.org/sessionstore.js sessionstore.js] in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder]
* http://kb.mozillazine.org/Session_Restore
Make sure that you do not use [[Clear Recent History]] to clear the "Browsing History" if Firefox is closed because that prevails and prevents Firefox from opening tabs from the previous session.
If you use CCleaner then make sure that Session is unchecked in the settings for the Firefox application.

The App Tabs I have set should open as App Tabs when I start Firefox again, but they don't!

When I create App Tabs they appear, but after closing and reopening Firexfox they have disappeared. Does this have to do with the settings of saving browsing history?

App tabs and Tab Groups (Panorama) are stored as part of the session data in the file [http://kb.mozillazine.org/sessionstore.js sessionstore.js] in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder]
* http://kb.mozillazine.org/Session_Restore
Make sure that you do not use [[Clear Recent History]] to clear the "Browsing History" if Firefox is closed because that prevails and prevents Firefox from opening tabs from the previous session.
If you use CCleaner then make sure that Session is unchecked in the settings for the Firefox application.

"All of the App Tabs you have set when you close Firefox will open as App Tabs when you start Firefox again." No they don't. Why? FF4 for mac.

I set the Ap Tabs but when I close and reopen they are not there. It just opens to my homepage tab again.

It is possible that there is a problem with the files [http://kb.mozillazine.org/sessionstore.js sessionstore.js] and sessionstore.bak in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Profile Folder]
Delete the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.
* Help > Troubleshooting Information > Profile Directory: Open Containing Folder
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/sessionstore.js
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. 
Deleting sessionstore.js will cause App Tabs and Tab Groups to get lost, so you will have to create them again (make a note).
See also:
* http://kb.mozillazine.org/Session_Restore

Tried to upgrade from firefox 3.6.2 to 3.6.3, error message says another instance of firefox is running, then 3.6.2 opens. This occurs when i start firefox after restarting the computer, or when i try to install the upgrade

Whenever i try to open firefox, i get a message that firefox cannot install the upgrade because another instance of firefox is running. Then firefox 3.6.2 will start. running windows 7 64 bit. This will occur every time i try to open firefox, after rebooting or any time i close it and reopen firefox.
== This happened ==
Every time Firefox opened
== I Ok'd the upgrade from 3.6.2 to 3.6.3

Do a clean (re)install and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
You can skip the step to create a new profile, that is not necessary for this issue.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

All of the App Tabs I have set when I close Firefox will not open as App Tabs when you start Firefox again.

the browser opens without any tabs just the main bar and the tabs below it

It is possible that there is a problem with the files [http://kb.mozillazine.org/sessionstore.js sessionstore.js] and sessionstore.bak in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Profile Folder]
Delete the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.
* Help > Troubleshooting Information > Profile Directory: Open Containing Folder
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/sessionstore.js
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. 
Deleting sessionstore.js will cause App Tabs and Tab Groups to get lost, so you will have to create them again (make a note).
See also:
* http://kb.mozillazine.org/Session_Restore

Passwords after storing are automatically being cleared when i start firefox the very next time

when firefox asks me whether to save passwords i always click remember because i don't like to enter the passwords again and again and i only use this computer.
recently, the stored passwords are being cleared when i start firefox.
and firefox asks whether to save passwords again and again.
i have tried the solutions: there are no exceptions, no private browsing and passwords are cleared after shutdown option is not selected. is there a solution for this????

If you use cleanup software like CCleaner then check the settings for the Firefox application.
Start Firefox in [[Safe Mode]] to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

I recently updated to version 5.0, however, when I open up a link in a new window, there is no address in the new window's address bar, just a blank box.

I recently updated to version 5.0, however, when I open up a link in a new window, there is no address in the new window's address bar, just a blank box.

Start Firefox in [[Safe Mode]] to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
* https://support.mozilla.com/kb/Safe+Mode
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
* Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
In Firefox 4 you can use one of these to start in [[Safe mode]]:
* Help > Restart with Add-ons Disabled
* Hold down the Shift key while double clicking the Firefox desktop shortcut (Windows)
* https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

When I start Firefox a plugin update page keeps opening. This just started. How do I turn it off.

When I start Firefox my homepage and now the plugin update page open.

This issue was caused by a bug to blocklist plugins and that has been fixed. 
You can correct this issue by forcing the file blocklist.xml to update or wait until Firefox updates the blocklist.xml file during the next hours. 
That update will remove the severity="0" flags in the file that had caused the problem.
See:
* [/questions/832793?page=2#answer-198407]

Recently updated addons open their own page when I start Firefox

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