My apologies to the developer, I've tried to contact you by e-mail about this but received no response. If you feel this review is unnecessary and you will fix the existing bugs, just let me know and I will promptly remove this.
Toggle Find Bar provides a nice functionality for easy access to the find bar. However, it has some issues with the quick find bar, as some users have already mentioned in previous reviews.
I have written my own add-on, called "FindBar Tweak", which also allows you to toggle the find bar through it's shortcut, with a few behavior improvements to make it more intuitive to use. I would invite everyone to switch to FBT, which ensures it will remain compatible with future versions of Firefox and as bug-free as I can make it!
I'm sorry for the spam, but I believe my add-on now becomes a necessary alternative to Toggle Find Bar, which is beginning to show signs of important bugs, while the developer is apparently unreachable.