Unfortunately it's hard to access /any/ information on a page without accessing /all/ information on a page. Unless the page can expose the data itself (say, th

Unfortunately it's hard to access /any/ information on a page without accessing /all/ information on a page. Unless the page can expose the data itself (say, through an API) an extension will need to access the DOM. Accessing the DOM means data leakage from that page to potentially any server.