* refactor: Simplify Firefox master key retrieval and decryption functions.
- Simplify variable names and functions in browsingdata/password/password.go
- Modify Decrypt function for each PBE type to have only one parameter named globalSalt in crypto/crypto.go
- Implement functions to retrieve master key from Firefox's key4.db file and query metadata and private NSS data in browser/firefox/firefox.go
* chore: Add dependencies and tests to Firefox package.
- Add go-sqlmock and github.com/kisielk/sqlstruct dependencies
- Add tests for Firefox package metadata and nssPrivate query
- Add test for Firefox's processMasterKey function (currently commented out)
* refactor: Refactor Firefox test functions, remove unused code
- Remove unused test function in firefox_test.go file
- Clean up code by removing unnecessary changes
- Simplify file structure for easier maintenance and readability
