Updated Firefox but add-ons download page won't see my Firefox browser even with it set as default.

I have updated my Firefox browser to current. When attempting to download an add-on, I get the popup screen requesting for me to download Firefox browser. I have redownloaded it 4 times. Still no luck. Firefox is set as default. Add-ons still give me this message: "To install ... and thousands of other Firefox add-ons, get Firefox, a free and open web browser from Mozilla. To learn more about Firefox and how it can make your internet experience better, click the button below."
== This happened ==
Every time Firefox opened
== Downloaded Firefox 3.6 ==
== User Agent ==
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3) Gecko/20100401 NET_mmhpset

Check your user-agent: Help > About Mozilla Firefox.
Your original user-agent when you posted shows no browser name/version number:
''Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3) Gecko/20100401 NET_mmhpset''
My user-agent (pretty vanilla, no toolbar add-ons, etc.):
''Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 - Build ID: 20100401080539''
See the difference? Yours does not show '''''Firefox/3.6.3''''' or the Build ID. I have seen that '''NET_mmhpset''' on other users who have posted here, but I do not know what it is.
If you follow the instructions and it keeps changing back, then you have something installed that keeps changing the user-agent.
Just to be sure:
-You did right-click on the item below the filter area in about:config and choose Reset?
-You did restart Firefox after making the change?
'''Safe Mode'''
You may need to use '''[[Safe Mode]]''' (click on "Safe Mode" and read) to localize the problem. Firefox Safe Mode is a diagnostic mode that disables Extensions and some other features of Firefox. If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes '''before''' starting Safe Mode. When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode". Test to see if the problem you are experiencing is corrected.
See:
'''[[Troubleshooting extensions and themes]]'''
'''[[Troubleshooting plugins]]'''
'''[[Basic Troubleshooting]]'''
If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it by enabling '''one at a time''' until the problem reappears. '''You MUST close and restart Firefox after EACH change''' via File > Restart Firefox (on Mac: Firefox > Quit). You can use "Disable all add-ons" on the Safe mode start window.

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Setting Up a Separate Portable Firefox 3.6.x that runs independently of and simultaneously to your latest version of Firefox
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http://www.mediafire.com/?o95nkwo8y6q535j
Here is the download link:
http://www.mediafire.com/?xdw87ivf3184u2s
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