In that case, reload the current page in Safari and try again. In particular, please note that Safari App Extensions do not seem to work on pages you opened before the extension was enabled. Please reload them and try again.
To remove the Safari Extension, delete ALL instances of "Haste.app" (or "Haste-beta.app" for beta versions) files from your computer and restart Safari. (It took us a while to figure this out!)
Yes. You will be able to export your Custom Searches as .haste files, and import them into the product release.
The product release of the application will be distributed as freemium on the App Store, and there will be a limit to the number of Custom Searches that can be enabled in the free version. You will be able to remove the limit via In-App Purchase.
The public beta will expire and become unavailable after certain date (Check [Preferences - Beta] to view the expiration date). If the current beta has expired, Get the new version on the Haste website or download the product release in the App Store.