Hi there,
I went through the requirements of the project you have listed here. I have developed quite a few chrome extensions before as part of my projects. Would like to work with you on this.
Based on my understanding of the project:
1. You need a login to this extension. Do we have backend API to login a user?
2. "Reads the browser content". Does this mean, the currently open browser tab's text in that page?
3. "Gives ability to select and save the content"? Does this mean copying that content to clipboard?
4. Crossref API integration -- not sure what this is about
5. "Sync with web server" -- Send the copied data through some REST APIs?
You can ping me to discuss further about it, in case we want to take it forward.
Cheers