The Helperbird Chrome Extension can be added via this direct link: https://chromewebstore.google.com/detail/helperbird-accessibility/ahmapmilbkfamljbpgphfndeemhnajme?hl=en

After following that link, simply select Add to Chrome:

After it's been added, go to the puzzle piece in the top right corner and choose the Pin next to Helperbird:

Helperbird is also in the list of PSD Recommended Google Chrome Extensions: https://chromewebstore.google.com/org/recommended