Streak can be installed directly from the Chrome Web Store as an extension.
- Open Streak's extension in the Chrome Web Store.
- From the top-right corner, select Add to Chrome.
- Confirm installation by selecting Add extension in the pop-up in the top-center of Chrome.
- Refresh or navigate to Gmail.
Streak is available as an extension from the Mac App Store and can be installed from there.
- Open Streak's extension in the Mac App Store.
- Select Get and then Install Now.
- Once installation is complete, click Open.
- Click Open Safari Preferences in the Install Streak for Safari window.
- Mark the checkboxes next to Streak and Streak Helper to enable them in Safari Preferences.
- Refresh or navigate to Gmail in your Safari browser.