How to install Chrome extension in development mode

1. Download development version from link
2. Unzip downloaded file (double click)
3. Visit chrome://extensions in Chrome
4. Enable 'Developer mode' in top right corner
5. Then click 'Load unpacked'
6. Select unziped folder
7. 🎉 That's it. In top right corner shoud be displayed GoRewind icon

How to install Firefox extension from file

1. Download version from link
2. Open Firefox
3. Tap on Menu -> Add-ons in top right corner
4. Click on Settings -> Install Add-on From File
5. Open downloaded file
6. 🎉 That's it. In top right corner should be displayed GoRewind icon