FireGestures script that opens a link or the current url in mpv

firegestures_open_in_mpv.js

var mpv_exec = "/usr/bin/mpv";

function runCMD(cmd, args) {
    // debug
    console.log("executing: '" + cmd + "' with arguments " + args.toString());
    
    // see: https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/nsIProcess
    // create an nsIFile for the executable
    var file = Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsIFile);
    file.initWithPath(cmd);

    // create an nsIProcess
    var process = Components.classes["@mozilla.org/process/util;1"].createInstance(Components.interfaces.nsIProcess);
    process.init(file);
    
    // Run the process.
    // If first param is true, calling thread will be blocked until called process terminates.
    // Second and third params are used to pass command-line arguments to the process.
    process.run(false, args, args.length);
}

var url = FireGestures.getLinkURL() || FireGestures.sourceNode.ownerDocument.location.href;
if (url) {
    runCMD(mpv_exec, ["--player-operation-mode=pseudo-gui", url]);
}
else {
    console.log("unable to find url");
}