Hello, The main problem is the storage. To install Firefox, there must be a designated amount of space for Firefox to store data e.g. (passwords and bookmarks) To fix this, try deleting temporary files and freeing up disk space, such as clearing the downloads folder or any unwanted misc stuff. (windows) Temp folder : Win + R then type '''%temp%''', or '''temp''' to go into the system temp folder. Hope it helps!