When i try to use firefox it says that install.rdf is not well formed or doesn't exist. what can i do?

i click the firefox button on my desktop and a window pops up saying what i wrote in my question. i turn the window off and firefox opens normally. it says exactly this:
Firefox could not install this item because "install.rdf" (provided by the item) is not well formed or does not exist. Please inform the authors about this problem.

This error can be caused by an extension that tries to install a plugin in a way that is not compatible with current Firefox versions.
Do you see any disabled extensions in Tools > Add-ons > Extensions ?
See:
*[[Troubleshooting extensions and themes]]
*[[Troubleshooting plugins]]

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When I try to open firefox it says that it is not responding, after I disabled the adobe flash plug-in it worked, how do I get it to work with flash

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See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]

When I try to open firefox, it says that a session is already running and I need to close it before I can run another session, I cannot find the session that's running, what can I do?

This happens after I have used firefox and exited the program. When I try to reuse the program I get this message. Is there a setting within firefox causing this or ??? I have tried to locate the session running without any luck. Would appreciate any help. I have uninstalled the program and then reinstalled it, but nothing has changed it continues to malfunction.

See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]

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In Firefox 3.6.4 and later the default connection settings have been changed to "Use the system proxy settings".
See "Firefox connection settings" in [[Server not found]]
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Firefox keeps running in the backround after closing it, it just lingers there, and when I try to restart firefox, it says that I have to close the current one or restart my system to clear the last firefox. what can I do, thanks...

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Must be the "hang at exit" problem. 
#Stop the Firefox process:
#*[http://kb.mozillazine.org/Kill_application Mozillazine - Kill application]
#*Windows 7 users click [http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576 here]
#Why Firefox may hang:
#*[http://support.mozilla.com/en-US/kb/Firefox+hangs Firefox hangs] (see Hang at exit)
#*[http://kb.mozillazine.org/Firefox_hangs Firefox hangs (Mozillazine)] (see Hang at exit and Closing Firefox properly)
#*[https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding Firefox is already running but is not responding]
#Use Firefox Safe Mode to find a problem with an Extension or Plugin:
#*Don't check anything when entering Safe Mode, just continue
#*If the problem does not occur in Safe Mode it is probably and Extension or Plugin causing the problem
#*See:
#**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
#**[http://support.mozilla.com/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]
'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''
Not related to your question, but...
You need to update some plug-ins:
*Plug-in check: https://www-trunk.stage.mozilla.com/en-US/plugincheck/
*Next Generation Java Plug-in for Mozilla browsers: [https://support.mozilla.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

When I try to update Firefox it says that "you do not have sufficient privileges for some items." This is my personal laptop. I'm stuck. Thanks

I'm working on a Mac laptop. Currently Firefox is on version 3.6. I've never been able to update the browser. Any suggestions? Thank you

If there are problems with updating or with the permissions then easiest is to download the full version and trash the currently installed version to do a clean install of the new version.
Download a new copy of the Firefox program and save the disk image (dmg) file to the desktop
* Firefox 7.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Trash the current Firefox application to do a clean (re-)install
* Install the new version that you have downloaded
Your profile data is stored elsewhere in the Firefox Profile Folder, so you won't lose your bookmarks and other personal data if you uninstall and (re)install Firefox.
* http://kb.mozillazine.org/Profile_folder_-_Firefox

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I DOWNLOADED FIREFOX 10 ON MY WINDOWS 7 COMPUTER I REBOOTED AS TOLD BUT WHEN I TRY TO OPEN FIREFOX IT SAYS IT HAS TO BE REBOOTED; WHEN I TRY TO UNINSTALL IT SAYS IT HAS TO BE REBOOTED OVER AND OVER AGAIN in English

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Exactly what did you do to "try to transfer all of yoru photos" to the iMac?
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# Question
there are times when I try to start firefox 3.6 that it does not come up,but when I click it again, I get fire fox is running but not responding, close fire fox, or shut down computer. There are other times that it starts up normally wit no probs
..

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When i try to use firefox it says that install.rdf is not well formed or doesn't exist. what can i do?

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