[byuu]

Likewise. I am currently running Classic Theme Restorer, oldbar, Cookies Manager+, Download Cleaner, plus the usual stuff (Adblock and such.) Not only do I have to trust a bunch of third-party devs I don't know; it also takes longer and longer to setup and start using Firefox on a fresh install.

And indeed like you said ... the signing thing is a huge issue. oldbar in particular hasn't been touched since 2008. I've also had to manually load Greasemonkey before, and many times I've had to manually edit the XPI file compatibility ranges so that I could install certain extensions.