Based on what you wrote, the firefox addon is not your tool. I recommend that you go through the SQL Server Import and Export Wizard (which is located inside the Start - Programs - SQL Server folder). There you can select the source and target databases.
But before you start, you will need to create an ODBC connection to your sqlite database. Use the open source driver to install the ODBC connection string into your sqlite database.
Then, in the SQL Server Import and Export Wizard, select ".NET Framework Data Provider for ODBC" as the source database and enter the connection string. You will also need to designate the target SQL Server database in the next step.
After that, the wizard will provide you with options to import
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