.SLT File Extension
Mozilla User Profile Folder
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What is an SLT file?
Contains user profile data for Mozilla programs such as Firefox and Thunderbird; may include bookmarks, browsing history, and cached data; typically saved with a random filename, followed by the ".slt" extension.
In Windows Vista, the Firefox SLT folder is saved in the "Users\Profile\AppData\Roaming\Mozilla\Firefox\Profiles" directory. In Mac OS X, it is located in the "~/Library/Mozilla/Profiles/[profile name]/" directory.