Thanks Rated 4 out of 5 stars

tested in FF12a2(auto complete 3.0)
I stille have to press escape before opening about:config to bypass the matching results.

the global on/off option seems useless since enable/disable add-on needn't restart. We could consider this as a global switch.

This review is for a previous version of the add-on (3.0.1-signed.1-signed).  This user has other reviews of this add-on.

The global On/Off only toggles the auto complete part, leaving the instant preview part in tact.
What is your first matching result by the way?
Can you send me a screen shot ?