Tip: How to run Firefox w/ temporary profile w/o jpm/web-ext

How to run a Firefox instance with a temporary profile without jpm (jpm run) or web-ext (web-ext run)

1. Create a temporary profile using firefox-profile.

   const FirefoxProfile = require("firefox-profile");
   new Promise((resolve, reject) => {
     let profile = new FirefoxProfile();
     profile.setPreference("devtools.chrome.enabled", true);
     // ..append preferences as you want..
     profile.updatePreferences();
   
     profile.encoded((zippedProfile) => {
       resolve(profile, zippedProfile);
       // Note: you can obtain profile directory by `profile.profileDir`!
     });
   });

2. Run firefox instance using node-firefo-connect.

   const FxRunner = require("fx-runner/lib/run");
   FxRunner({
     "no-remote": true,
     "profile": profileDir, // profile.profileDir
     "env": process.env,
   });

   • Note: FxRunner returns a Promise object that is resolved just after the Firefox process starts.

     FxRunner({ /* ..snip.. */ }).then((results) => {
       /* Any Firefox window have not been open yet. */
       return new Promise((resolve, reject) => {
         require("timer").setTimeout(() => resolve(results), 1000);
       });
     }).then((results) => {
       /* Firefox window is already open. */
     });

3. You do not have to delete the temporary profile. "firefox-profile" do it on process exit.

Example: Run firefox with remote debugging