appdata is a folder not a file. Open the file manager and look about 1/2 down the left side you should see the c: drive. Expand it out and you will see a folder called "Users" (without the quotes) expand it out, then under that you will see a folder with your account user name expand that out. Now you should see a folder called appdata expand it out and you should have a "local" folder, expand it out and you should see several different sub-folders for many of your programs you have installed. See if there is still a Mozilla folder.
I did that first, before trying a search.