clone and build leveldb-cli
go get github.com/liderman/leveldb-cli
cd ~/go/src/github.com/liderman/leveldb-cli
go install
dump the JSON data from Brave Nightly's Crypto Wallets extension (default)
./dump-extension-data.sh
dump data from Crypto Wallets in a custom profile
PROFILE=/path/to/profile ./dump-extension-data.sh
dump data from an arbitrary extension in a custom profile
EXTENSION=abcdefghijklmnop PROFILE=/path/to/profile ./dump-extension-data.sh