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The Launcher Process is a security-related feature that was enabled for all users in the Firefox version 68 release. When running Windows as an Administrator with User Account Control (UAC) disabled and the launcher process enabled, Firefox users may experience unexpected behavior.
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Why the problem occurs
When the launcher process detects that it is running at a high integrity level, it will force Firefox to run at a medium integrity level. This intentional security feature is intended to prevent malicious code from gaining write access to sensitive areas of the operating system. Windows does not allow programs running at a lower integrity level to send data to programs running at a higher integrity level. As a result, users may experience errors when trying to drag and drop from Firefox to another application.
How to verify the problem
To verify this condition, make sure the user is operating Windows as a full Administrator and has disabled User Account Control (UAC) settings. Enter in the address bar and look under Application Basics for the Launcher Process entry. If the Launcher Process is enabled, you may experience errors when trying to drag and drop an image or URL from Firefox to another application or to the Windows desktop (for example, when you try to create a desktop shortcut to a website).
How to fix
To fix the problem, users have two options.
Re-enable UAC
First, users can re-enable UAC on their PC. To do so, type in the search field on your taskbar by right-clicking the Start button and selecting Search. Click . To turn UAC on, drag the slider to , click and then restart the computer. This option is the most secure fix available.
Start Firefox Using the -no-deelevate command
Alternatively, users can solve the issue by launching Firefox using the command line option, either directly from the command line or by editing their Firefox shortcut to do so.
Partial workaround
Copy and Paste often can substitute for drag-and-drop. For example, a user can right-click on an image and choose , then right-click on the Windows desktop and choose . Where practicable, this is preferred to reducing security by using the command line option.
