Hello valygirl, please try one more time follow the next steps:

1. Download a copy of the latest firefox from http://www.mozilla.org/en-US/firefox/all.html (full dmg package)

2. Trash the current Firefox application to do a clean install.

3. Install the version that you have downloaded.

Do not select to remove your personal data, your profile data is stored elsewhere in the Firefox Profile Folder, so you won't lose your bookmarks or other personal data.

see also: How to download and install Firefox on Mac

thank you

Hello again, I have done what you suggested & now can't get on Firefox at all. I have it downloaded & when I click on it, it opens a disk image at the top right corner of my screen. When I click on that, I just get my applications folder box. Can you please tell me what I'm doing wrong? Thank you!

Open that Firefox disk image file and then drag Firefox program in the Applications folder on your hard drive. Do not double click Firefox application to run it from the disk image, but drag it out of the dmg folder. Any luck ?

Yes, that worked & I am able to use Firefox. So far I haven't received any "unable to update messages". I have the Firefox orange & blue globe icon down at the botton of my screen with my other icons. However, I have this orange Firefox disc sitting in the right top corner of my screen. How can I get rid of that? Thanks so much for all your help!