Firefox is an amazing web browser with user profiles feature. You can create two or more profiles for Firefox each of which has its separate settings, configurations, bookmarks and add-ons. You can use these different profiles for different requirements, for example, one profile for gaming online, another for internet banking, third one for social networking sites and so on. If you use multiple Firefox profiles then you can use the Profile Switcher extension to quickly switch from one profile to another.
You can install the Profile Switcher add-on from the Mozilla add-ons website. The installation of this add-on requires you to restart the web browser and it can be used immediately after the restart. After the restart, you would see extra items in the File menu of Firefox. You can use this menu to quickly switch to another profile. To do so, click on the orange colored Firefox button and select Launch another profile and then choose a profile name.
If you have not yet created a second profile for Firefox, then you can do this through the Profile Manager. The Profile Switcher extension also adds a new item in the File menu so that you can quickly access the Profile Manager.
In the Profile Switcher extension options, you can choose the default behavior about what happens when you switch the Firefox profiles. You can also choose to display currently selected profile name in the add-ons bar or the titlebar.
So if you want to quickly switch Firefox profiles without having to close the Firefox browser first and then running it through command line, then you can use the Profile Switcher extension. It can save you a great deal of time if you are a regular profile switcher.
You can download and install the Profile Switcher add-on from https://addons.mozilla.org/.