If you are working with multiple profiles in Firefox you have probably your own ingenious way of launching them. Some Firefox users may use shortcuts to launch their profiles, others the built-in profile manager, the command line or an add-on like Switchy
If you are new to the concept, I suggest you take a look at the following guides that will get you started. Only this much: Most Firefox users use profiles to separate work related activities from private activities. This reduces the browser's memory usage and accessibility, among other things.
Profile Switcher is another extension for Firefox that you can use for various profile related tasks. You can access the extension's functionality with a click on the Firefox menu button. The two entries Launch another profile and Open profile manager have been added to the menu. The current profile name is displayed in the browser's status bar as well. You can right-click the name to display the very same menu.
The add-on ships with a button that you can drag and drop to one of the Firefox toolbars instead if you prefer to work with the Profile Switcher extension this way.
The open profile manager menu lets you open Firefox's built-in profile manager in normal mode or safe mode. You can use the profile manager to create, rename, delete or start profiles. Keep in mind though that Mozilla plans to remove this tool from Firefox to replace it with an external launcher.
The launch another profile menu allows you to launch one of the available profiles directly from within the Firefox web browser. Depending on how you have configured your profiles, you may be able to run multiple profiles at the same time or only one. If the latter is the case, you need to close Firefox before you can open the new profile.
The Profile Switcher add-on can be downloaded from Mozilla's official Firefox add-on repository. The same add-on is also available as a version for the Thunderbird email client.
Update: The profile switcher add-on seems to have been pulled from Mozilla's Add-ons repository. The page is no longer accessible, and a search does not list the extension. An alternative is the Mozilla Profile Manager, a standalone application that you can use to manage and start different Firefox profiles.
If you are using Firefox 29 or newer, you can also use Profilist which adds profile management capabilities to the browser interface.
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