Set to 0 milliseconds to disable auto-hiding of the Find-As-You-Type toolbar entirely.
To restore full Find-in-page functionality to it, put this in your userChrome.css:
true
Set to false to disable audio feedback on find string mismatch.
true
Whether to display the protocol:// in the address bar
true
Set to false to automatically allow Browser Toolbox debugging connections.
0
Set to 1 to enable "Match Diacritics" in the Find bar by default. Very useful for languages where umlauts consitute whole new characters. (A ≠ Ä)
false
Set to true to enable straighforward content and UI customization via the Browser Toolbox and userContent.css & userChrome.css
3
The amount arrow keys scroll a document. I like 7.
Zen Browser specific preferences
true
Set to false to turn off the misguided feature of each browser window replicating each others's tabs. Thanks, Curtis McHale.