Can't get Firefox to "downgrade" Java JRE version

I recently allowed the Java updater to update my Java JRE from 1.6.x to 1.7.x. However I have a critical web site that will not run the applet unless it sees a 1.6x "only" JRE. (yes, it is a dumb site) . Anyway, I removed the 1.7 version, and re-installed 1.6 but Firefox still shows the 1.7 version in my add-ons and I can't remove the references or get them to update to 1.6x.
I still can't get the web site to launch the applet that I need from FF because it thinks I am not running 1.6x. I am NOT having this problem using IE8.. it seems to have downgraded just fine.

You can see the installed plugins that are enabled on the about:plugins page.
* http://kb.mozillazine.org/about%3Aplugins
You can set the plugin.expose_full_path pref to true on the about:config page to see the full path of plugins on the about:plugins page.<br />
*http://kb.mozillazine.org/about:config
It is best not to leave that pref set to true as it exposes that full path to web servers, so reset that pref to false after you are done with the about:plugins page.
See "Manually uninstalling a plugin":
* https://support.mozilla.org/kb/Troubleshooting+plugins

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I have tried all can not get firefox to search for website

I run Windows XP.
It all began with the fiollowing error - "could not load xpcom. From there I redownloaded and installed - the foillowing scenario followed on this.
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I re downloaded and installed firefox, 3 times, no difference.
My home page shows on my desk top screen - but it clearly does not work as it will not do any searches and connect to other websites.
When trying to use in "Options" it closes the firefox home page, as though I had exited it.
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I am now at a total loss and desperate to get back to work having wasted 22 days already trying to repair same.
I tried the automatically install add ons as per this very "automatically add" button, but it says Firefox can not modify the required file.
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As I said, I have read about all.
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I would like some one to give me a step by step solution if there is one.
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It told me (for some reason) about 5 days ago ..."could not load xpcom."
I have read and read and eventually found what I thought would be the solution. - Reinstall.
I re downloaded/installed the latest version of Firefox. Now the page opens but it is inert - does no searching and does not accept any search engine addition - neither does it provide a choice of search engine as it used to do.
I USED THE FIREFOX PAGE ABOUT 5 DAYS AGO SAME COMPUTER.
I can open various url's which i have saved for research purposes and also things like my bank account to do tfrs. No problem.
My email also works fine.
For some reason the newly installed version of Firefox does not see the internet or react to anything - (have reinstalled 3 times) -neither does it accept anything one types into the search field - when I click to activate the search it simply deletes it.
I need some "help fpr dummies" please
Thank you for your interest to help - much appreciated.
Hans

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