Replaced with extensions.ini in Thunderbird 1.5 and above. Lists extension folders with XPCOM components. This file is automatically generated and can safely be deleted. Thunderbird 3.x appears to use the version information to decide whether to display additional tabs such as the migration assistant and whats new. When the profile is loaded with an application with a different version/path, the XPCOM components registration process is triggered. Stores the version and path of the application this profile was last used with. There is a similar file in Firefox profiles used by localstorage/DOMStorage to store about: pages. It appears to store the host name, thus preventing you from creating a security exception for a rotating SMTP server. This is an optional file used to store a security exception. It works together with key4.db, and should be copied together. It works together with ke圓.db, and should be copied together. Used by the Lightning add-on if the 'Cache' option is enabled in the calendar properties, to provide offline support. Replaced by kinto.sqlite around version 60. Suspect it is used with the blocking listĪdded list of dangerous extensions. Temporary empty file that signals a change in the installed extensions. If any are read-only it might be a side effect of having put files on removable media, and then copying them or restoring them back to your profile.

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