It looks promising.
Here is the earlier work-around....
We cannot help you, if you don't understand the title of this post, if so, don't read it.
Book Burro is a Firefox extension that will take you to a lot of book vendors and libraries to find a book from an Amazon web page.
Have you been missing the Book Burro extension (or others that are not officially compatible) since you upgraded to Firefox 3.5?
If so, here is a hack to restore it to life from lifehacker.
about:configinto Firefox's address bar and click the "I'll be careful, I promise!" button.
- Right-click anywhere. Choose New>Boolean. Make the name of your new config value
extensions.checkCompatibilityand set it to
- Make another new boolean pair called
extensions.checkUpdateSecurityand set the value to
- Restart Firefox.