Since we Haven’t Heard back from you for so long, We are closing this issue.
Please feel free to reach out to us for any other concerns if you have,
Thanks for reaching out to us for your concerns.
If you want to use your Add-On Tools in browser, i would request you to kindly do as below
1) Launch acrobat and go to Tools center
Now when you will launch a pdf in browser with acrobat, you'll be able to see those Add on tools in the Right hand panel in the browser as well.
Let me know if that solves your concerns ?