Never ceases to amaze me that people release a product and provide absolutely no instructions. Not a single syllable! I've been a user for a while of the CAMELCAMELCAMEL extension. Just installed the version for FF4, not a clue after 10 minutes how to activate the function. COME ON. If I can't access the features you don't receive an affiliate payment and we all lose. How about some instructions!
The Camelizer works the same as it used to...Unfortunately, Firefox 4 hides the "addons bar" (which replaced the status bar) by default, so you have to toggle the that before it will appear. Or you can add our Camel icon to your toolbar, just like in previous versions.
Hopefully this will help resolve your issues and earn us more than an angry one star. I've updated the add-on's listing to reflect this information.