Follow the instructions on the main README.md

1. Clone GhostText on your computer with git clone https://github.com/GhostText/GhostText.git
2. Visit chrome:https://extensions/ in Chrome
3. Enable the Developer mode in the upper-right corner
4. Use the "Load unpacked extension…" button on the left
5. Select the folder browser inside your newly cloned project

1. Clone GhostText on your computer with git clone https://github.com/GhostText/GhostText.git
2. Visit about:debugging#addons in Firefox
3. Click on Load Temporary Add-on
4. Select the file browser/manifest.json inside your newly cloned project