You might have needs to open multiple FireFox instances at once for multiple tasks, it’s not just open more and more tabs, but also cookies, authentication session, website, bookmarks, online accounts….That mean multiple FireFox, multiple workspaces/

If you’d love to like so, here is tips to do

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  1. Download FireFox Portable Editon from portableapps.com.
  2. Run file you have just downloaded, it will extract to where you choose to place your FireFox Portable
  3. Open folder you have just extracted and looking for files [FireFox Portable]\Other\Source\FirefoxPortable.ini
  4. Open FirefoxPortable.ini and change AllowMultipleInstances=false to AllowMultipleInstances=true
  5. Save FirefoxPortable.ini
  6. Copy FirefoxPortable.ini to root folder of [FireFox Portable]
  7. Clone folder [FireFox Portable] as many as you’d like, each of them will be a single FireFox instances
  8. Each time, just choose a folder of them and run FirefoxPortable.exe
  9. Hope you love it.