This book does not even begin to work as a tutorial. Chapter 2, "Getting Started" is poorly organized, with continuous forward references "we show you this here, but we explain it in 3/5/10 pages or in chapter X". Getting Started should be giving an overview from the top down, which doesn't require forward reference, whereas this basically starts describing detail after detail, incompletely, and as mentioned, with forward references that only obfuscate the topic.
At the end of Chapter 2 it's noted that you should grasp this material before moving on, but quite honestly, I can't see how that's possible. I can't even get the examples to work with Mozilla 1.2.1 or Phoenix 0.5, and I know this stuff works generally because I've installed extensions from mozilla.org into both browsers. When I finally set up my installed-chrome.txt file (which BTW didn't exist until I created it), the path is somehow wrong somewhere so my browsers can't find the xfly application, but there is nothing like sufficient information in Chapter 2 to help me figure out what's wrong with the path--I've set the directory structure exactly as described and all the dirs are 755 and files 644 permissions.
I have to say this is the most disappointing O'Reilly book I have ever purchased.
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