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+Once you have set up your multiple profiles, either for an [installed](https://github.com/ghacksuserjs/ghacks-user.js/wiki/2.1-Multiple-Profiles) or [portable](https://github.com/ghacksuserjs/ghacks-user.js/wiki/2.2-Multiple-Profiles-%5BFirefox-Portable%5D) Firefox, you can use them one at at time (the default), or run them concurrently.
+
+Use the above links to learn about using the switches
+ * `-no-remote` (installed)
+ * `AllowMultipleInstances=true` (portable)
+
+These switches allow multiple profiles, multiple firefoxes, and even different versions, to all run simultaneously.
+
+### :small_orange_diamond: Example
+
+Here is a sample `<username>\AppData\Roaming\Mozilla\Firefox\profiles.ini` and it's matching Profile Manager
+```ini
+[General]
+StartWithLastProfile=1
+
+[Profile0]
+Name=medium
+IsRelative=0
+Path=D:\UserData\Firefox\Profiles\medium
+
+[Profile1]
+Name=relaxed
+IsRelative=0
+Path=D:\UserData\Firefox\Profiles\relaxed
+
+[Profile2]
+Name=hardened
+IsRelative=0
+Path=D:\UserData\Firefox\Profiles\hardened
+```
+
+![](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/wikipiki/concurrent01.png)
+
+Here are four shortcuts
+```js
+"C:\Program Files\Mozilla Firefox\firefox.exe" -no-remote -p "medium"
+"C:\Program Files\Mozilla Firefox\firefox.exe" -no-remote -p "hardened"
+"C:\Program Files\Mozilla Firefox\firefox.exe" -no-remote -p "relaxed"
+"C:\Program Files\Mozilla Firefox\firefox.exe" -p
+```
+And here are all three profiles running concurrently, with both normal and private browsing mode windows
+
+![](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/wikipiki/concurrent02.png)
+