I have 4.0 installed, have downloaded 5.o several times but cannot install it - the message is that I "don't have permission"; using a mac book pro OS 10.6.

Have been unsuccessful many times in updating firefox. I get the messages: do you want to replace earlier version? I click yes, then get message stating I don't have permission to install the newer version. There has been no asking for a password to install this on my Mac, which is what I assume may be needed for the installation.
How can I achieve this?
At times I have been offered ( by firefox) an opportunity to connect with their updater, but this connection has lasted 30 min., with no success, so I have closed the window.

If you have 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 DMG file to the desktop
* Firefox 5.0.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 [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder], so you won't lose your bookmarks and other personal data.

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