Did you create a new profile? If not, its best to create a new profile when using a new release.
Try about:config, and search for xpinstall.enabled. Set it to true. This setting doesnt exist in 1.5 anymore, and if you upgraded and it
was disabled in your previous version, then it would be here too.
In the address bar, just type about:config and hit enter. Then in the Filter bar enter xpinstall.enabled. Double click the row to invert
the value if it isnt already True. If it IS true and it doesnt work, then I dunno how to fix it.
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