I downloaded the new 5.0b7 version, but I have OS 10.4.11 and now I can't log on at all.

How can I get back to the original version I had before this rescent down load?
I can't even open FireFox now.

Firefox 5.0 is a final release since June 21 and not a Beta as where ever you download the 5.0 Beta 7 is outdated.
Sorry but as of Firefox 4.0 and newer the old Mac OSX 10.4.x is no longer supported as OSX 10.5.x is the minimum along with Intel for Firefox 4.0 and newer including Firefox 5.0.
You can use the still supported Firefox 3.6 which is at 3.6.18 at http://www.mozilla.com/en-US/firefox/all-older.html or if you were using a PPC and not a Intel then there was this third-party option at http://www.floodgap.com/software/tenfourfox/
http://www.mozilla.com/en-US/firefox/5.0/system-requirements/
http://www.mozilla.com/en-US/firefox/4.0/system-requirements/
http://www.mozilla.com/en-US/firefox/3.6/system-requirements/

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