From MozillaZine Knowledge Base
webappsstore.sqlite contains DOM Storage data. This data is set by web sites much in the same way as cookies.
webappsstore.sqlite is a binary SQLite file and should not be edited manually.
This file can be moved to a different profile without any extra effort.
Deleting webappsstore.sqlite will delete any data web sites have stored there. A new file will be created when it is needed.
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