Giving 3 stars because I'm all for the idea and think Firefox Desktop's "profiles" feature should be added to the Android/Mobile version ASAP. However, this extension is not very clear on how to actually use it, and appears to only let you create profiles per website, instead of one for all websites. I can't find a clear guide on how to properly use this, but if I am misunderstanding how the extension is meant to work, then I will gladly change my rating!