Everytime I click on a link and a new tab/window opens to open the link - i get an alert that says URL is not valid and cnnot be loaded. I click ok and the page loads fine. How do I get rid of this alert?

See above

Actually the OP is running Firefox 3.6.8, but has a user agent that is corrupted by an extension (NET_mmhpset)
You can check the '''general.useragent''' prefs on the about:config page.<br />
You can open the '''about:config''' page via the location bar, just like you open a website.<br />
Filter: general.useragent<br />
If '''general.useragent''' prefs are bold (user set) then you can right-click that pref and choose Reset.<br />
<br />
See [[Web sites or add-ons incorrectly report incompatible browser]] and [[Finding your Firefox version]]
See also http://kb.mozillazine.org/Resetting_your_useragent_string_to_its_compiled-in_default

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