I try to write my very first webextension, following this tutorial. I wrote a manifest.json and added a background script as I want to provide global functionality: I want to clear the search bar once the search was performed - basically it's this, but for Firefox 57+.
My question: How can I access the search bar at all?
I found a list of available APIs, including the tabs, the menus, and so on, but no search bar...