Provides even more level of control over how new windows will be created. Firefox 1.0 added some of this by allowing you to tell it to create new windows as new tabs instead, but Tabbrowser Preferences takes it to the new level. I have it set to open all new windows as tabs instead, in the background and have Firefox hopefully not take focus from the program that sent it. This allows me to click on links in email newsletters without having Firefox come to the front, but also without having to manually create a new tab for each one. I can now open all the links I’m interested in, and read them later.
And here’s the link.