ZAP is a community project, and we love working with other OSS security projects.
Browser based projects can be particularly powerful when combined with ZAP, and we already have ZAP add-ons which wrap 3 x 3rd party projects:
We also now have a guide to explain how you can create a ZAP add-on for your browser extension:
If you think that integrating your OSS browser based security project with ZAP could be useful to anyone then ping me!
Simon