Rated 1 out of 5 stars

I'm sorry, is not available in a standard feature?

This review is for a previous version of the add-on (1.0.1-signed). 

This addon extends the exceptions dialogs by providing a search bar for the exceptions dialogs (almost anywhere you see "Exceptions" in the Options dialog, except notably for the password version). These are different to the about:permissions dialog, which does come with a search. There is still no such stock search function in the latest version of FireFox at the time of this reply (v34).

I am flattered that you found the extension to look so stock you didn't notice, that was one of my design goals as I believe the functionality should have been there from FireFox 3 (31 generations ago! How time flies).