This is the SQLite amalgamation. Check sqlite3.h for the version number and source id. See http://www.sqlite.org/ for more info. We have a mozilla-specific moz.build in src/ (normally no moz.build there) that we use to build. To move to a new version: Copy the sqlite3.h and sqlite3.c files from the amalgamation of sqlite. Be sure to update SQLITE_VERSION accordingly in $(topsrcdir)/configure.in.