You already can install our browser extension to Microsoft Edge Beta.
Follow simple steps:
1. Click on the menu button with 3 dots.
2. Select Extensions from the menu.
3. Enable the "Allow extensions from other stores option".
4. Go to https://chrome.google.com/webstore/detail/raindropio/ldgfbffkinooeloadekpmfoklnobpien and click "Add to Chrome"
More convenient way will be added as soon as Microsoft would allow to add third party extensions to they store.