I want to write a Chrome extension that allows users to send emails directly from the omnibox. Is it possible to directly execute Google Apps Script code, such as the Gmail
Yes, you can but with some limitation If you publish your apps script code as a webapp which will be accessible publicly, you can make a GET request to the webapp URL to execute the Apps Script code.
e.g
doGet(e){
//use e.parameter here
//write your apps script code
return ContentService.createTextOutput('your return content');
}
after publishing it, say you got a URL like
https://script.google.com/macros/s/djihwerd98ejdeijded/exec
Now make a request from your chrome app
GET https://script.google.com/macros/s/djihwerd98ejdeijded/exec?param=value