Mac OS 10.4, new Firefox not compatible, old Firefox disappeared

I got an on line offer to install the new Firefox. Clicked yes, tried it, but it is not compatible with my MacOS 10.4.11. The older Firefox--along with ALL my bookmarks and notes, disappeared. I am trying to update profile information for an airline and they won't accept Safari. I need to make these reservations!

Firefox 4 requires at least OS X 10.5 and an Intel Mac.
* http://www.mozilla.com/firefox/4.0/system-requirements/
For an unofficial Firefox 4 compatible version that runs on Mac OS X 10.4.11 or Mac OS X 10.5.8 (PowerPC) you can look at:
* http://www.floodgap.com/software/tenfourfox/
Firefox 3.6.x (Mac OS X 10.4 and later) can be found here:
* http://www.mozilla.com/en-US/firefox/all-older.html

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