Because Firefox 4 apparently is not compatible my computer, I cannot open Firefox . How do remove Version 4 and go back to the previous version?

You sent me a Firefox update which I installed.Now I cannot open Firefox

hello and thank you for your suggestion. I have tried it and, when trying to open a program which I previously was able to, still get the following message:
Remote XUL
This page uses an unsupported technology that is no longer available by default in Firefox.
Please contact the website owners to inform them of this problem.
Seems unbelievable that I previously had no problem and now I do. Have you any suggestions to overcome this? Do you think I can go back further in Firefox history to get a version that will make it possible to access this. Many thanks! Lynn

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    hello and thank you for your suggestion. I have tried it and, when trying to open a program which I previously was able to, still get the following message:
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    # Question
    Ever since I got the "new & improved" Firefox, I have had all kinds of problems the latest of which has left me without toolbars. How can I get back to the previous version? edit
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