Access Selected Text Within A Hotkey Object

Is it possible to grab user's selected text within Hotkey's scope? Defined in Addon/lib/main.js: var showHotKey = Hotkey({ combo: 'accel-f1', onPress: function() {

Solution 1:

Yes, the easiest way would be to use the selection module.

var { Hotkey } = require("sdk/hotkeys");
var selection = require("sdk/selection");

var showHotKey = Hotkey({
    combo: "accel-f1",
    onPress: function() {
        console.error(selection.text);
    }
});

If you require something more complex, have a look at tabs.activeTab.attach(), which has an example showing how to interact with the active tab in general.