A free excerpt from Hacking Firefox Extensions book is available on ExtremeTech right now. The author explains how to get older extensions to work with the latest Firefox releases and troubleshoot all sorts of problems. If you love Firefox and want to learn deep about it, read it (and buy the book later :p ).

The following section covers what you might have to do to get an abandoned or older extension working for you in the latest release. This chapter is also a good primer for understanding the fundamentals of extensionsâ€â€?from how they are packaged to how to quickly get older extensions and functionality back up and running. Later in this chapter, I’ll walk you through the process of cleaning up your profile and references to older extensions so that you have a clean slate to start installing extensions and themes again

Another recommended books about Firefox:

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