Install Signal Desktop as a standalone app, without Chrome dependency *
There is now an easier way with automatic Signal Desktop installer, which also keeps Signal auto updated.
This guide is for Linux systems, but as Node.js and NW.js are cross-platform, it is more or less the same for macOS and Windows. I will provide CLI commands, as they are universal for different Linux distros, but most of the steps could be as easily done with your GUI apps of choice.
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Install NW.js: