To build the extension, run npm run build-linux for Linux or npm run build-mac for MacOS (Window users must use WSL and choose the Linux option).
Note: This also builds the Next.JS output, which is not needed if you are developing the pure extension. If you do not need to build the Next JS server, you can then instead use npm run build-fast-linux or npm run build-fast-mac .
The built folder is extension_out. In Chrome Extensions, Select "Load Unpacked" and select that folder.