An .html file in a drive could only be read as source. It can now also be
opened as a web page in a new tab (Theseus tab, browser tab, or the system
browser from the desktop app), with the CSS, images, scripts and pages
beside it loading as they would from a website.
The page is served under a sandbox CSP without allow-same-origin, so its
scripts run in an opaque origin: they cannot read the Pithos session or
reach its API, only the files of the folder the page link covers. Links
are random, last an hour from last use (12 hours at most), and refuse
paths that leave the folder. Pages decrypt on the fly for drives hosted
on Silent Mode.